66477951632 has 10 divisors (see below), whose sum is σ = 128801031318. Its totient is φ = 33238975808.

The previous prime is 66477951619. The next prime is 66477951649. The reversal of 66477951632 is 23615977466.

It can be written as a sum of positive squares in only one way, i.e., 56804048896 + 9673902736 = 238336^2 + 98356^2 .

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 as a sum of consecutive naturals, namely, 2077435973 + ... + 2077436004.

Almost surely, 2^66477951632 is an apocalyptic number.

It is an amenable number.

66477951632 is a deficient number, since it is larger than the sum of its proper divisors (62323079686).

66477951632 is a wasteful number, since it uses less digits than its factorization.

66477951632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154871985 (or 4154871979 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 56.

The spelling of 66477951632 in words is "sixty-six billion, four hundred seventy-seven million, nine hundred fifty-one thousand, six hundred thirty-two".