66760647651 has 24 divisors (see below), whose sum is σ = 96839206464. Its totient is φ = 44319461040.

The previous prime is 66760647641. The next prime is 66760647697. The reversal of 66760647651 is 15674606766.

It is a happy number.

66760647651 is a `hidden beast` number, since 6 + 67 + 60 + 6 + 476 + 51 = 666.

It is not a de Polignac number, because 66760647651 - 2¹⁹ = 66760123363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66760647641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3003360 + ... + 3025506.

It is an arithmetic number, because the mean of its divisors is an integer number (4034966936).

Almost surely, 2^66760647651 is an apocalyptic number.

66760647651 is a deficient number, since it is larger than the sum of its proper divisors (30078558813).

66760647651 is a wasteful number, since it uses less digits than its factorization.

66760647651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23551 (or 23548 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 66760647651 in words is "sixty-six billion, seven hundred sixty million, six hundred forty-seven thousand, six hundred fifty-one".