161642656824 has 32 divisors (see below), whose sum is σ = 440843610240. Its totient is φ = 48982623200.

The previous prime is 161642656817. The next prime is 161642656831. The reversal of 161642656824 is 428656246161.

It is an interprime number because it is at equal distance from previous prime (161642656817) and next prime (161642656831).

It is a super-2 number, since 2×161642656824² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306141132 + ... + 306141659.

It is an arithmetic number, because the mean of its divisors is an integer number (13776362820).

Almost surely, 2^161642656824 is an apocalyptic number.

It is an amenable number.

161642656824 is an abundant number, since it is smaller than the sum of its proper divisors (279200953416).

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

161642656824 is a wasteful number, since it uses less digits than its factorization.

161642656824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612282811 (or 612282807 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The spelling of 161642656824 in words is "one hundred sixty-one billion, six hundred forty-two million, six hundred fifty-six thousand, eight hundred twenty-four".