638615705051 has 2 divisors, whose sum is σ = 638615705052. Its totient is φ = 638615705050.

The previous prime is 638615705047. The next prime is 638615705069. The reversal of 638615705051 is 150507516836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638615705051 - 2² = 638615705047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638615704987 and 638615705005.

It is not a weakly prime, because it can be changed into another prime (638615705041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319307852525 + 319307852526.

It is an arithmetic number, because the mean of its divisors is an integer number (319307852526).

Almost surely, 2^638615705051 is an apocalyptic number.

638615705051 is a deficient number, since it is larger than the sum of its proper divisors (1).

638615705051 is an equidigital number, since it uses as much as digits as its factorization.

638615705051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 638615705051 in words is "six hundred thirty-eight billion, six hundred fifteen million, seven hundred five thousand, fifty-one".