665051363456651 has 4 divisors (see below), whose sum is σ = 665516759793600. Its totient is φ = 664585967119704.

The previous prime is 665051363456603. The next prime is 665051363456707. The reversal of 665051363456651 is 156654363150566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665051363456651 - 2⁶ = 665051363456587 is a prime.

It is a super-2 number, since 2×665051363456651² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665051363455651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232698166331 + ... + 232698169188.

It is an arithmetic number, because the mean of its divisors is an integer number (166379189948400).

Almost surely, 2^{665051363456651} is an apocalyptic number.

665051363456651 is a deficient number, since it is larger than the sum of its proper divisors (465396336949).

665051363456651 is a wasteful number, since it uses less digits than its factorization.

665051363456651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465396336948.

The product of its (nonzero) digits is 174960000, while the sum is 62.

The spelling of 665051363456651 in words is "six hundred sixty-five trillion, fifty-one billion, three hundred sixty-three million, four hundred fifty-six thousand, six hundred fifty-one".