155461439439072 has 480 divisors, whose sum is σ = 494725087977120. Its totient is φ = 47606609571840.

The previous prime is 155461439439043. The next prime is 155461439439077. The reversal of 155461439439072 is 270934934164551.

155461439439072 is a `hidden beast` number, since 1 + 5 + 5 + 4 + 6 + 1 + 439 + 43 + 90 + 72 = 666.

155461439439072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155461439439077) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9182050447 + ... + 9182067377.

It is an arithmetic number, because the mean of its divisors is an integer number (1030677266619).

Almost surely, 2^{155461439439072} is an apocalyptic number.

155461439439072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155461439439072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247362543988560).

155461439439072 is an abundant number, since it is smaller than the sum of its proper divisors (339263648538048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155461439439072 is a wasteful number, since it uses less digits than its factorization.

155461439439072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18248 (or 18231 counting only the distinct ones).

The product of its (nonzero) digits is 97977600, while the sum is 63.

The spelling of 155461439439072 in words is "one hundred fifty-five trillion, four hundred sixty-one billion, four hundred thirty-nine million, four hundred thirty-nine thousand, seventy-two".