155511154351232 has 64 divisors (see below), whose sum is σ = 311719523560800. Its totient is φ = 77275701264384.

The previous prime is 155511154351181. The next prime is 155511154351237. The reversal of 155511154351232 is 232153451115551.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (155511154351237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636834983 + ... + 637079129.

Almost surely, 2^{155511154351232} 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 155511154351232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155859761780400).

155511154351232 is an abundant number, since it is smaller than the sum of its proper divisors (156208369209568).

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

155511154351232 is a wasteful number, since it uses less digits than its factorization.

155511154351232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274853 (or 274841 counting only the distinct ones).

The product of its digits is 450000, while the sum is 44.

The spelling of 155511154351232 in words is "one hundred fifty-five trillion, five hundred eleven billion, one hundred fifty-four million, three hundred fifty-one thousand, two hundred thirty-two".