161979041623 has 24 divisors (see below), whose sum is σ = 210008862000. Its totient is φ = 123794673408.

The previous prime is 161979041611. The next prime is 161979041629. The reversal of 161979041623 is 326140979161.

It is not a de Polignac number, because 161979041623 - 2²⁵ = 161945487191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161979041629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5101348 + ... + 5133001.

It is an arithmetic number, because the mean of its divisors is an integer number (8750369250).

Almost surely, 2^161979041623 is an apocalyptic number.

161979041623 is a deficient number, since it is larger than the sum of its proper divisors (48029820377).

161979041623 is a wasteful number, since it uses less digits than its factorization.

161979041623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10234399 (or 10234392 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 161979041623 in words is "one hundred sixty-one billion, nine hundred seventy-nine million, forty-one thousand, six hundred twenty-three".