665764754601 has 4 divisors (see below), whose sum is σ = 887686339472. Its totient is φ = 443843169732.

The previous prime is 665764754581. The next prime is 665764754623. The reversal of 665764754601 is 106457467566.

665764754601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 665764754601 - 2⁶ = 665764754537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665764754101) 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, 110960792431 + ... + 110960792436.

It is an arithmetic number, because the mean of its divisors is an integer number (221921584868).

Almost surely, 2^665764754601 is an apocalyptic number.

It is an amenable number.

665764754601 is a deficient number, since it is larger than the sum of its proper divisors (221921584871).

665764754601 is a wasteful number, since it uses less digits than its factorization.

665764754601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221921584870.

The product of its (nonzero) digits is 25401600, while the sum is 57.

The spelling of 665764754601 in words is "six hundred sixty-five billion, seven hundred sixty-four million, seven hundred fifty-four thousand, six hundred one".