666172735451 has 2 divisors, whose sum is σ = 666172735452. Its totient is φ = 666172735450.

The previous prime is 666172735421. The next prime is 666172735463. The reversal of 666172735451 is 154537271666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666172735451 - 2²² = 666168541147 is a prime.

It is a super-2 number, since 2×666172735451² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666172735393 and 666172735402.

It is not a weakly prime, because it can be changed into another prime (666172735421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333086367725 + 333086367726.

It is an arithmetic number, because the mean of its divisors is an integer number (333086367726).

Almost surely, 2^666172735451 is an apocalyptic number.

666172735451 is a deficient number, since it is larger than the sum of its proper divisors (1).

666172735451 is an equidigital number, since it uses as much as digits as its factorization.

666172735451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6350400, while the sum is 53.

The spelling of 666172735451 in words is "six hundred sixty-six billion, one hundred seventy-two million, seven hundred thirty-five thousand, four hundred fifty-one".