666420524 has 24 divisors (see below), whose sum is σ = 1454009088. Its totient is φ = 259644240.

The previous prime is 666420499. The next prime is 666420539. The reversal of 666420524 is 425024666.

666420524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 1081544 + ... + 1082159.

It is an arithmetic number, because the mean of its divisors is an integer number (60583712).

Almost surely, 2^666420524 is an apocalyptic number.

It is an amenable number.

666420524 is an abundant number, since it is smaller than the sum of its proper divisors (787588564).

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

666420524 is a wasteful number, since it uses less digits than its factorization.

666420524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163725 (or 2163723 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 666420524 is about 25815.1220024233. The cubic root of 666420524 is about 873.4729387893.

The spelling of 666420524 in words is "six hundred sixty-six million, four hundred twenty thousand, five hundred twenty-four".