636749401423 has 2 divisors, whose sum is σ = 636749401424. Its totient is φ = 636749401422.

The previous prime is 636749401411. The next prime is 636749401439. The reversal of 636749401423 is 324104947636.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636749401423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636749401523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318374700711 + 318374700712.

It is an arithmetic number, because the mean of its divisors is an integer number (318374700712).

Almost surely, 2^636749401423 is an apocalyptic number.

636749401423 is a deficient number, since it is larger than the sum of its proper divisors (1).

636749401423 is an equidigital number, since it uses as much as digits as its factorization.

636749401423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 636749401423 in words is "six hundred thirty-six billion, seven hundred forty-nine million, four hundred one thousand, four hundred twenty-three".