155161440 has 288 divisors, whose sum is σ = 632590560. Its totient is φ = 35417088.

The previous prime is 155161439. The next prime is 155161459. The reversal of 155161440 is 44161551.

155161440 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 614 + 40 = 666.

155161440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 211314 + ... + 212046.

It is an arithmetic number, because the mean of its divisors is an integer number (2196495).

Almost surely, 2^155161440 is an apocalyptic number.

155161440 is a gapful number since it is divisible by the number (10) 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 155161440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316295280).

155161440 is an abundant number, since it is smaller than the sum of its proper divisors (477429120).

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

155161440 is a wasteful number, since it uses less digits than its factorization.

155161440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 155161440 is about 12456.3814970480. The cubic root of 155161440 is about 537.3549664577.

The spelling of 155161440 in words is "one hundred fifty-five million, one hundred sixty-one thousand, four hundred forty".