667622761261 has 32 divisors (see below), whose sum is σ = 726899298048. Its totient is φ = 610719728640.

The previous prime is 667622761219. The next prime is 667622761279. The reversal of 667622761261 is 162167226766.

It is a de Polignac number, because none of the positive numbers 2^k-667622761261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667622761199 and 667622761208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667622761061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170701896 + ... + 170705806.

It is an arithmetic number, because the mean of its divisors is an integer number (22715603064).

Almost surely, 2^667622761261 is an apocalyptic number.

It is an amenable number.

667622761261 is a deficient number, since it is larger than the sum of its proper divisors (59276536787).

667622761261 is a wasteful number, since it uses less digits than its factorization.

667622761261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5061.

The product of its digits is 3048192, while the sum is 52.

The spelling of 667622761261 in words is "six hundred sixty-seven billion, six hundred twenty-two million, seven hundred sixty-one thousand, two hundred sixty-one".