665877646620607 has 8 divisors (see below), whose sum is σ = 675829415676800. Its totient is φ = 655926268644504.

The previous prime is 665877646620569. The next prime is 665877646620629. The reversal of 665877646620607 is 706026646778566.

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 665877646620607 - 2⁷ = 665877646620479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665877646627607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94338357 + ... + 101150782.

It is an arithmetic number, because the mean of its divisors is an integer number (84478676959600).

Almost surely, 2^{665877646620607} is an apocalyptic number.

665877646620607 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

665877646620607 is a deficient number, since it is larger than the sum of its proper divisors (9951769056193).

665877646620607 is a wasteful number, since it uses less digits than its factorization.

665877646620607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195540045.

The product of its (nonzero) digits is 5120962560, while the sum is 76.

The spelling of 665877646620607 in words is "six hundred sixty-five trillion, eight hundred seventy-seven billion, six hundred forty-six million, six hundred twenty thousand, six hundred seven".