155109661888 has 56 divisors (see below), whose sum is σ = 316364530592. Its totient is φ = 75399081984.

The previous prime is 155109661879. The next prime is 155109661901. The reversal of 155109661888 is 888166901551.

It is a super-2 number, since 2×155109661888² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3046045 + ... + 3096547.

Almost surely, 2^155109661888 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 155109661888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158182265296).

155109661888 is an abundant number, since it is smaller than the sum of its proper divisors (161254868704).

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

155109661888 is a wasteful number, since it uses less digits than its factorization.

155109661888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51849 (or 51839 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 58.

The spelling of 155109661888 in words is "one hundred fifty-five billion, one hundred nine million, six hundred sixty-one thousand, eight hundred eighty-eight".