66767975990 has 32 divisors (see below), whose sum is σ = 122246629920. Its totient is φ = 26248665600.

The previous prime is 66767975957. The next prime is 66767975999. The reversal of 66767975990 is 9957976766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66767975999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3424670 + ... + 3444110.

It is an arithmetic number, because the mean of its divisors is an integer number (3820207185).

Almost surely, 2^66767975990 is an apocalyptic number.

66767975990 is a deficient number, since it is larger than the sum of its proper divisors (55478653930).

66767975990 is a wasteful number, since it uses less digits than its factorization.

66767975990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25328.

The product of its (nonzero) digits is 270050760, while the sum is 71.

The spelling of 66767975990 in words is "sixty-six billion, seven hundred sixty-seven million, nine hundred seventy-five thousand, nine hundred ninety".