638614054651 has 2 divisors, whose sum is σ = 638614054652. Its totient is φ = 638614054650.

The previous prime is 638614054597. The next prime is 638614054679. The reversal of 638614054651 is 156450416836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638614054651 - 2⁹ = 638614054139 is a prime.

It is a super-3 number, since 3×638614054651³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638614054595 and 638614054604.

It is not a weakly prime, because it can be changed into another prime (638614054681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319307027325 + 319307027326.

It is an arithmetic number, because the mean of its divisors is an integer number (319307027326).

Almost surely, 2^638614054651 is an apocalyptic number.

638614054651 is a deficient number, since it is larger than the sum of its proper divisors (1).

638614054651 is an equidigital number, since it uses as much as digits as its factorization.

638614054651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 638614054651 in words is "six hundred thirty-eight billion, six hundred fourteen million, fifty-four thousand, six hundred fifty-one".