666416332461 has 64 divisors (see below), whose sum is σ = 1037207669760. Its totient is φ = 376118799360.

The previous prime is 666416332451. The next prime is 666416332469. The reversal of 666416332461 is 164233614666.

It is a happy number.

666416332461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666416332461 - 2⁵ = 666416332429 is a prime.

It is a super-2 number, since 2×666416332461² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666416332461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666416332469) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52637350 + ... + 52650008.

It is an arithmetic number, because the mean of its divisors is an integer number (16206369840).

Almost surely, 2^666416332461 is an apocalyptic number.

It is an amenable number.

666416332461 is a deficient number, since it is larger than the sum of its proper divisors (370791337299).

666416332461 is a wasteful number, since it uses less digits than its factorization.

666416332461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13674.

The product of its digits is 2239488, while the sum is 48.

The spelling of 666416332461 in words is "six hundred sixty-six billion, four hundred sixteen million, three hundred thirty-two thousand, four hundred sixty-one".