161601510651 has 16 divisors (see below), whose sum is σ = 256956440064. Its totient is φ = 88328775744.

The previous prime is 161601510617. The next prime is 161601510731. The reversal of 161601510651 is 156015106161.

It is not a de Polignac number, because 161601510651 - 2⁹ = 161601510139 is a prime.

It is a super-2 number, since 2×161601510651² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161611510651) 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, 167288866 + ... + 167289831.

It is an arithmetic number, because the mean of its divisors is an integer number (16059777504).

Almost surely, 2^161601510651 is an apocalyptic number.

161601510651 is a deficient number, since it is larger than the sum of its proper divisors (95354929413).

161601510651 is a wasteful number, since it uses less digits than its factorization.

161601510651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334578730.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 161601510651 in words is "one hundred sixty-one billion, six hundred one million, five hundred ten thousand, six hundred fifty-one".