155897938639872 has 2376 divisors, whose sum is σ = 572448665338368. Its totient is φ = 40580504616960.

The previous prime is 155897938639871. The next prime is 155897938639903. The reversal of 155897938639872 is 278936839798551.

155897938639872 is a `hidden beast` number, since 1 + 5 + 5 + 8 + 9 + 79 + 3 + 86 + 398 + 72 = 666.

It is a super-2 number, since 2×155897938639872² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155897938639871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 532074875758 + ... + 532074876050.

Almost surely, 2^{155897938639872} is an apocalyptic number.

155897938639872 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 155897938639872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286224332669184).

155897938639872 is an abundant number, since it is smaller than the sum of its proper divisors (416550726698496).

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

155897938639872 is a wasteful number, since it uses less digits than its factorization.

155897938639872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 466 counting only the distinct ones).

The product of its digits is 49380710400, while the sum is 90.

The spelling of 155897938639872 in words is "one hundred fifty-five trillion, eight hundred ninety-seven billion, nine hundred thirty-eight million, six hundred thirty-nine thousand, eight hundred seventy-two".