639099968503 has 2 divisors, whose sum is σ = 639099968504. Its totient is φ = 639099968502.

The previous prime is 639099968371. The next prime is 639099968509. The reversal of 639099968503 is 305869990936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639099968503 - 2¹³ = 639099960311 is a prime.

It is a super-2 number, since 2×639099968503² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639099968509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319549984251 + 319549984252.

It is an arithmetic number, because the mean of its divisors is an integer number (319549984252).

Almost surely, 2^639099968503 is an apocalyptic number.

639099968503 is a deficient number, since it is larger than the sum of its proper divisors (1).

639099968503 is an equidigital number, since it uses as much as digits as its factorization.

639099968503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85030560, while the sum is 67.

The spelling of 639099968503 in words is "six hundred thirty-nine billion, ninety-nine million, nine hundred sixty-eight thousand, five hundred three".