639814533091 has 2 divisors, whose sum is σ = 639814533092. Its totient is φ = 639814533090.

The previous prime is 639814533067. The next prime is 639814533133. The reversal of 639814533091 is 190335418936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639814533091 - 2⁷ = 639814532963 is a prime.

It is not a weakly prime, because it can be changed into another prime (639814533011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319907266545 + 319907266546.

It is an arithmetic number, because the mean of its divisors is an integer number (319907266546).

Almost surely, 2^639814533091 is an apocalyptic number.

639814533091 is a deficient number, since it is larger than the sum of its proper divisors (1).

639814533091 is an equidigital number, since it uses as much as digits as its factorization.

639814533091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 639814533091 in words is "six hundred thirty-nine billion, eight hundred fourteen million, five hundred thirty-three thousand, ninety-one".