725164501666 has 16 divisors (see below), whose sum is σ = 1187662032288. Its totient is φ = 329334336000.

The previous prime is 725164501591. The next prime is 725164501667. The reversal of 725164501666 is 666105461527.

It is not an unprimeable number, because it can be changed into a prime (725164501667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14268660 + ... + 14319391.

It is an arithmetic number, because the mean of its divisors is an integer number (74228877018).

Almost surely, 2^725164501666 is an apocalyptic number.

725164501666 is a deficient number, since it is larger than the sum of its proper divisors (462497530622).

725164501666 is a wasteful number, since it uses less digits than its factorization.

725164501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28589217.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 725164501666 in words is "seven hundred twenty-five billion, one hundred sixty-four million, five hundred one thousand, six hundred sixty-six".