166394087646 has 32 divisors (see below), whose sum is σ = 337384051200. Its totient is φ = 54700314240.

The previous prime is 166394087623. The next prime is 166394087647. The reversal of 166394087646 is 646780493661.

It is a super-3 number, since 3×166394087646³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166394087646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166394087647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218365 + ... + 616823.

It is an arithmetic number, because the mean of its divisors is an integer number (10543251600).

Almost surely, 2^166394087646 is an apocalyptic number.

166394087646 is an abundant number, since it is smaller than the sum of its proper divisors (170989963554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166394087646 is a wasteful number, since it uses less digits than its factorization.

166394087646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399424.

The product of its (nonzero) digits is 31352832, while the sum is 60.

The spelling of 166394087646 in words is "one hundred sixty-six billion, three hundred ninety-four million, eighty-seven thousand, six hundred forty-six".