166551402 has 16 divisors (see below), whose sum is σ = 333414432. Its totient is φ = 55465200.

The previous prime is 166551391. The next prime is 166551403. The reversal of 166551402 is 204155661.

It is a self number, because there is not a number n which added to its sum of digits gives 166551402.

It is not an unprimeable number, because it can be changed into a prime (166551403) 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, 5724 + ... + 19127.

It is an arithmetic number, because the mean of its divisors is an integer number (20838402).

Almost surely, 2^166551402 is an apocalyptic number.

166551402 is an abundant number, since it is smaller than the sum of its proper divisors (166863030).

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

166551402 is a wasteful number, since it uses less digits than its factorization.

166551402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25973.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 166551402 is about 12905.4795339034. The cubic root of 166551402 is about 550.1943137105.

The spelling of 166551402 in words is "one hundred sixty-six million, five hundred fifty-one thousand, four hundred two".