66526864 has 10 divisors (see below), whose sum is σ = 128895830. Its totient is φ = 33263424.

The previous prime is 66526853. The next prime is 66526883. The reversal of 66526864 is 46862566.

It can be written as a sum of positive squares in only one way, i.e., 44997264 + 21529600 = 6708^2 + 4640^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66526864.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078949 + ... + 2078980.

It is an arithmetic number, because the mean of its divisors is an integer number (12889583).

Almost surely, 2^66526864 is an apocalyptic number.

It is an amenable number.

66526864 is a deficient number, since it is larger than the sum of its proper divisors (62368966).

66526864 is a wasteful number, since it uses less digits than its factorization.

66526864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4157937 (or 4157931 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The square root of 66526864 is about 8156.4001863567. The cubic root of 66526864 is about 405.1964986621.

The spelling of 66526864 in words is "sixty-six million, five hundred twenty-six thousand, eight hundred sixty-four".