66635651497 has 8 divisors (see below), whose sum is σ = 69536560320. Its totient is φ = 63735051600.

The previous prime is 66635651477. The next prime is 66635651501. The reversal of 66635651497 is 79415653666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-66635651497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66635651437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436279 + ... + 568867.

It is an arithmetic number, because the mean of its divisors is an integer number (8692070040).

Almost surely, 2^66635651497 is an apocalyptic number.

It is an amenable number.

66635651497 is a deficient number, since it is larger than the sum of its proper divisors (2900908823).

66635651497 is a wasteful number, since it uses less digits than its factorization.

66635651497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154463.

The product of its digits is 24494400, while the sum is 58.

The spelling of 66635651497 in words is "sixty-six billion, six hundred thirty-five million, six hundred fifty-one thousand, four hundred ninety-seven".