663751708427 has 2 divisors, whose sum is σ = 663751708428. Its totient is φ = 663751708426.

The previous prime is 663751708339. The next prime is 663751708471. The reversal of 663751708427 is 724807157366.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663751708427 - 2²⁸ = 663483272971 is a prime.

It is a super-2 number, since 2×663751708427² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (663751707427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331875854213 + 331875854214.

It is an arithmetic number, because the mean of its divisors is an integer number (331875854214).

Almost surely, 2^663751708427 is an apocalyptic number.

663751708427 is a deficient number, since it is larger than the sum of its proper divisors (1).

663751708427 is an equidigital number, since it uses as much as digits as its factorization.

663751708427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11854080, while the sum is 56.

The spelling of 663751708427 in words is "six hundred sixty-three billion, seven hundred fifty-one million, seven hundred eight thousand, four hundred twenty-seven".