66579690 has 16 divisors (see below), whose sum is σ = 159791328. Its totient is φ = 17754576.

The previous prime is 66579677. The next prime is 66579691. The reversal of 66579690 is 9697566.

It is a super-2 number, since 2×66579690² = 8865710240992200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66579691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109632 + ... + 1109691.

It is an arithmetic number, because the mean of its divisors is an integer number (9986958).

Almost surely, 2^66579690 is an apocalyptic number.

66579690 is an abundant number, since it is smaller than the sum of its proper divisors (93211638).

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

66579690 is a wasteful number, since it uses less digits than its factorization.

66579690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219333.

The product of its (nonzero) digits is 612360, while the sum is 48.

The square root of 66579690 is about 8159.6378596112. The cubic root of 66579690 is about 405.3037197449.

The spelling of 66579690 in words is "sixty-six million, five hundred seventy-nine thousand, six hundred ninety".