161619626889 has 32 divisors (see below), whose sum is σ = 274629661440. Its totient is φ = 92020634496.

The previous prime is 161619626837. The next prime is 161619626891. The reversal of 161619626889 is 988626916161.

161619626889 is a `hidden beast` number, since 1 + 6 + 1 + 619 + 6 + 2 + 6 + 8 + 8 + 9 = 666.

It is not a de Polignac number, because 161619626889 - 2¹⁵ = 161619594121 is a prime.

It is a super-2 number, since 2×161619626889² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (161619666889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1491204 + ... + 1595909.

It is an arithmetic number, because the mean of its divisors is an integer number (8582176920).

Almost surely, 2^161619626889 is an apocalyptic number.

It is an amenable number.

161619626889 is a deficient number, since it is larger than the sum of its proper divisors (113010034551).

161619626889 is a wasteful number, since it uses less digits than its factorization.

161619626889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087406 (or 3087400 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The spelling of 161619626889 in words is "one hundred sixty-one billion, six hundred nineteen million, six hundred twenty-six thousand, eight hundred eighty-nine".