155689660642 has 32 divisors (see below), whose sum is σ = 243536832000. Its totient is φ = 74580637248.

The previous prime is 155689660619. The next prime is 155689660649. The reversal of 155689660642 is 246066986551.

It is a super-2 number, since 2×155689660642² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155689660649) 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, 2144859 + ... + 2216257.

It is an arithmetic number, because the mean of its divisors is an integer number (7610526000).

Almost surely, 2^155689660642 is an apocalyptic number.

155689660642 is a deficient number, since it is larger than the sum of its proper divisors (87847171358).

155689660642 is a wasteful number, since it uses less digits than its factorization.

155689660642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71890.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 155689660642 in words is "one hundred fifty-five billion, six hundred eighty-nine million, six hundred sixty thousand, six hundred forty-two".