66951633956 has 12 divisors (see below), whose sum is σ = 117261641868. Its totient is φ = 33448307712.

The previous prime is 66951633913. The next prime is 66951633967. The reversal of 66951633956 is 65933615966.

It can be written as a sum of positive squares in 2 ways, for example, as 20115748900 + 46835885056 = 141830^2 + 216416^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66951633895 and 66951633904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6871841 + ... + 6881576.

It is an arithmetic number, because the mean of its divisors is an integer number (9771803489).

Almost surely, 2^66951633956 is an apocalyptic number.

It is an amenable number.

66951633956 is a deficient number, since it is larger than the sum of its proper divisors (50310007912).

66951633956 is a wasteful number, since it uses less digits than its factorization.

66951633956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13754638 (or 13754636 counting only the distinct ones).

The product of its digits is 23619600, while the sum is 59.

The spelling of 66951633956 in words is "sixty-six billion, nine hundred fifty-one million, six hundred thirty-three thousand, nine hundred fifty-six".