666774034401 has 24 divisors (see below), whose sum is σ = 908971974144. Its totient is φ = 434760385120.

The previous prime is 666774034397. The next prime is 666774034403. The reversal of 666774034401 is 104430477666.

It is not a de Polignac number, because 666774034401 - 2² = 666774034397 is a prime.

It is a super-2 number, since 2×666774034401² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666774034403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9860416 + ... + 9927806.

It is an arithmetic number, because the mean of its divisors is an integer number (37873832256).

Almost surely, 2^666774034401 is an apocalyptic number.

It is an amenable number.

666774034401 is a deficient number, since it is larger than the sum of its proper divisors (242197939743).

666774034401 is a wasteful number, since it uses less digits than its factorization.

666774034401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68981 (or 68934 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 48.

The spelling of 666774034401 in words is "six hundred sixty-six billion, seven hundred seventy-four million, thirty-four thousand, four hundred one".