161501605886 has 24 divisors (see below), whose sum is σ = 247661570520. Its totient is φ = 78964427120.

The previous prime is 161501605877. The next prime is 161501605927. The reversal of 161501605886 is 688506105161.

It is a self number, because there is not a number n which added to its sum of digits gives 161501605886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4286000 + ... + 4323516.

It is an arithmetic number, because the mean of its divisors is an integer number (10319232105).

Almost surely, 2^161501605886 is an apocalyptic number.

161501605886 is a deficient number, since it is larger than the sum of its proper divisors (86159964634).

161501605886 is an equidigital number, since it uses as much as digits as its factorization.

161501605886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37960 (or 37769 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 161501605886 in words is "one hundred sixty-one billion, five hundred one million, six hundred five thousand, eight hundred eighty-six".