155981867755 has 32 divisors (see below), whose sum is σ = 223362800640. Its totient is φ = 102305535360.

The previous prime is 155981867749. The next prime is 155981867761. The reversal of 155981867755 is 557768189551.

It is an interprime number because it is at equal distance from previous prime (155981867749) and next prime (155981867761).

It is not a de Polignac number, because 155981867755 - 2¹⁷ = 155981736683 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 609511 + ... + 826720.

It is an arithmetic number, because the mean of its divisors is an integer number (6980087520).

Almost surely, 2^155981867755 is an apocalyptic number.

155981867755 is a deficient number, since it is larger than the sum of its proper divisors (67380932885).

155981867755 is a wasteful number, since it uses less digits than its factorization.

155981867755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436379.

The product of its digits is 105840000, while the sum is 67.

The spelling of 155981867755 in words is "one hundred fifty-five billion, nine hundred eighty-one million, eight hundred sixty-seven thousand, seven hundred fifty-five".