172186461668 has 12 divisors (see below), whose sum is σ = 324505254780. Its totient is φ = 79470674592.

The previous prime is 172186461653. The next prime is 172186461679. The reversal of 172186461668 is 866164681271.

It can be written as a sum of positive squares in 2 ways, for example, as 68842214884 + 103344246784 = 262378^2 + 321472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655639003 + ... + 1655639106.

It is an arithmetic number, because the mean of its divisors is an integer number (27042104565).

Almost surely, 2^172186461668 is an apocalyptic number.

It is an amenable number.

172186461668 is a deficient number, since it is larger than the sum of its proper divisors (152318793112).

172186461668 is a wasteful number, since it uses less digits than its factorization.

172186461668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311278126 (or 3311278124 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 56.

The spelling of 172186461668 in words is "one hundred seventy-two billion, one hundred eighty-six million, four hundred sixty-one thousand, six hundred sixty-eight".