155117587782 has 32 divisors (see below), whose sum is σ = 311480116992. Its totient is φ = 51498455904.

The previous prime is 155117587721. The next prime is 155117587787. The reversal of 155117587782 is 287785711551.

It is a super-2 number, since 2×155117587782² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155117587787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11792133 + ... + 11805279.

It is an arithmetic number, because the mean of its divisors is an integer number (9733753656).

Almost surely, 2^155117587782 is an apocalyptic number.

155117587782 is an abundant number, since it is smaller than the sum of its proper divisors (156362529210).

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

155117587782 is a wasteful number, since it uses less digits than its factorization.

155117587782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20892.

The product of its digits is 5488000, while the sum is 57.

The spelling of 155117587782 in words is "one hundred fifty-five billion, one hundred seventeen million, five hundred eighty-seven thousand, seven hundred eighty-two".