66976194751 has 2 divisors, whose sum is σ = 66976194752. Its totient is φ = 66976194750.

The previous prime is 66976194721. The next prime is 66976194767. The reversal of 66976194751 is 15749167966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66976194751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66976194751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66976194721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33488097375 + 33488097376.

It is an arithmetic number, because the mean of its divisors is an integer number (33488097376).

Almost surely, 2^66976194751 is an apocalyptic number.

66976194751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66976194751 is an equidigital number, since it uses as much as digits as its factorization.

66976194751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 61.

The spelling of 66976194751 in words is "sixty-six billion, nine hundred seventy-six million, one hundred ninety-four thousand, seven hundred fifty-one".