66172875406 has 16 divisors (see below), whose sum is σ = 109499551920. Its totient is φ = 29740617280.

The previous prime is 66172875389. The next prime is 66172875449. The reversal of 66172875406 is 60457827166.

It is a congruent number.

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, 16896121 + ... + 16900036.

It is an arithmetic number, because the mean of its divisors is an integer number (6843721995).

Almost surely, 2^66172875406 is an apocalyptic number.

66172875406 is a deficient number, since it is larger than the sum of its proper divisors (43326676514).

66172875406 is a wasteful number, since it uses less digits than its factorization.

66172875406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33796259.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 66172875406 in words is "sixty-six billion, one hundred seventy-two million, eight hundred seventy-five thousand, four hundred six".