666425177397 has 24 divisors (see below), whose sum is σ = 1129863710976. Its totient is φ = 370522105056.

The previous prime is 666425177309. The next prime is 666425177417. The reversal of 666425177397 is 793771524666.

It is a happy number.

It is not a de Polignac number, because 666425177397 - 2¹⁸ = 666424915253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666425137397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142946013 + ... + 142950674.

It is an arithmetic number, because the mean of its divisors is an integer number (47077654624).

Almost surely, 2^666425177397 is an apocalyptic number.

It is an amenable number.

666425177397 is a deficient number, since it is larger than the sum of its proper divisors (463438533579).

666425177397 is a wasteful number, since it uses less digits than its factorization.

666425177397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285896737 (or 285896734 counting only the distinct ones).

The product of its digits is 80015040, while the sum is 63.

The spelling of 666425177397 in words is "six hundred sixty-six billion, four hundred twenty-five million, one hundred seventy-seven thousand, three hundred ninety-seven".