638083842551 has 2 divisors, whose sum is σ = 638083842552. Its totient is φ = 638083842550.

The previous prime is 638083842533. The next prime is 638083842587. The reversal of 638083842551 is 155248380836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638083842551 - 2³⁸ = 363205935607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638083842493 and 638083842502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638083842251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319041921275 + 319041921276.

It is an arithmetic number, because the mean of its divisors is an integer number (319041921276).

Almost surely, 2^638083842551 is an apocalyptic number.

638083842551 is a deficient number, since it is larger than the sum of its proper divisors (1).

638083842551 is an equidigital number, since it uses as much as digits as its factorization.

638083842551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5529600, while the sum is 53.

The spelling of 638083842551 in words is "six hundred thirty-eight billion, eighty-three million, eight hundred forty-two thousand, five hundred fifty-one".