155921808708768 has 96 divisors (see below), whose sum is σ = 430939153592640. Its totient is φ = 49226742835200.

The previous prime is 155921808708751. The next prime is 155921808708793. The reversal of 155921808708768 is 867807808129551.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×155921808708768² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155921808708768.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2511555 + ... + 17836802.

It is an arithmetic number, because the mean of its divisors is an integer number (4488949516590).

Almost surely, 2^{155921808708768} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155921808708768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215469576796320).

155921808708768 is an abundant number, since it is smaller than the sum of its proper divisors (275017344883872).

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

155921808708768 is a wasteful number, since it uses less digits than its factorization.

155921808708768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352590 (or 20352582 counting only the distinct ones).

The product of its (nonzero) digits is 541900800, while the sum is 75.

The spelling of 155921808708768 in words is "one hundred fifty-five trillion, nine hundred twenty-one billion, eight hundred eight million, seven hundred eight thousand, seven hundred sixty-eight".