66187930 has 16 divisors (see below), whose sum is σ = 119232000. Its totient is φ = 26454352.

The previous prime is 66187921. The next prime is 66187949. The reversal of 66187930 is 3978166.

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, 20571 + ... + 23569.

It is an arithmetic number, because the mean of its divisors is an integer number (7452000).

Almost surely, 2^66187930 is an apocalyptic number.

66187930 is a deficient number, since it is larger than the sum of its proper divisors (53044070).

66187930 is a wasteful number, since it uses less digits than its factorization.

66187930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66187930 is about 8135.5964747522. The cubic root of 66187930 is about 404.5072094009.

The spelling of 66187930 in words is "sixty-six million, one hundred eighty-seven thousand, nine hundred thirty".