66187974 has 16 divisors (see below), whose sum is σ = 138131712. Its totient is φ = 21103368.

The previous prime is 66187973. The next prime is 66187993. The reversal of 66187974 is 47978166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66187973) 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, 239674 + ... + 239949.

It is an arithmetic number, because the mean of its divisors is an integer number (8633232).

Almost surely, 2^66187974 is an apocalyptic number.

66187974 is an abundant number, since it is smaller than the sum of its proper divisors (71943738).

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

66187974 is a wasteful number, since it uses less digits than its factorization.

66187974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479651.

The product of its digits is 508032, while the sum is 48.

The square root of 66187974 is about 8135.5991789173. The cubic root of 66187974 is about 404.5072990361.

It can be divided in two parts, 66187 and 974, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 66187974 in words is "sixty-six million, one hundred eighty-seven thousand, nine hundred seventy-four".