161623765258 has 16 divisors (see below), whose sum is σ = 243052246944. Its totient is φ = 80606517040.

The previous prime is 161623765249. The next prime is 161623765361. The reversal of 161623765258 is 852567326161.

It is a super-2 number, since 2×161623765258² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1949916 + ... + 2031112.

It is an arithmetic number, because the mean of its divisors is an integer number (15190765434).

Almost surely, 2^161623765258 is an apocalyptic number.

161623765258 is a deficient number, since it is larger than the sum of its proper divisors (81428481686).

161623765258 is a wasteful number, since it uses less digits than its factorization.

161623765258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83717.

The product of its digits is 3628800, while the sum is 52.

The spelling of 161623765258 in words is "one hundred sixty-one billion, six hundred twenty-three million, seven hundred sixty-five thousand, two hundred fifty-eight".