665125206655 has 16 divisors (see below), whose sum is σ = 982338767424. Its totient is φ = 421002328320.

The previous prime is 665125206649. The next prime is 665125206701. The reversal of 665125206655 is 556602521566.

It is a de Polignac number, because none of the positive numbers 2^k-665125206655 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665125206599 and 665125206608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730906366 + ... + 730907275.

It is an arithmetic number, because the mean of its divisors is an integer number (61396172964).

Almost surely, 2^665125206655 is an apocalyptic number.

665125206655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

665125206655 is a deficient number, since it is larger than the sum of its proper divisors (317213560769).

665125206655 is a wasteful number, since it uses less digits than its factorization.

665125206655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461813666.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 665125206655 in words is "six hundred sixty-five billion, one hundred twenty-five million, two hundred six thousand, six hundred fifty-five".