665357605651 has 8 divisors (see below), whose sum is σ = 669111934400. Its totient is φ = 661604137920.

The previous prime is 665357605643. The next prime is 665357605687. The reversal of 665357605651 is 156506753566.

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

It is a cyclic number.

It is not a de Polignac number, because 665357605651 - 2³ = 665357605643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665357605592 and 665357605601.

It is not an unprimeable number, because it can be changed into a prime (665357605051) 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, 1367335 + ... + 1788943.

It is an arithmetic number, because the mean of its divisors is an integer number (83638991800).

Almost surely, 2^665357605651 is an apocalyptic number.

665357605651 is a deficient number, since it is larger than the sum of its proper divisors (3754328749).

665357605651 is a wasteful number, since it uses less digits than its factorization.

665357605651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430509.

The product of its (nonzero) digits is 17010000, while the sum is 55.

The spelling of 665357605651 in words is "six hundred sixty-five billion, three hundred fifty-seven million, six hundred five thousand, six hundred fifty-one".