639153091051 has 4 divisors (see below), whose sum is σ = 639246228192. Its totient is φ = 639059953912.

The previous prime is 639153091043. The next prime is 639153091097. The reversal of 639153091051 is 150190351936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 639153091051 - 2³ = 639153091043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639153090989 and 639153091007.

It is not an unprimeable number, because it can be changed into a prime (639153091751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46558276 + ... + 46572001.

It is an arithmetic number, because the mean of its divisors is an integer number (159811557048).

Almost surely, 2^639153091051 is an apocalyptic number.

639153091051 is a deficient number, since it is larger than the sum of its proper divisors (93137141).

639153091051 is an equidigital number, since it uses as much as digits as its factorization.

639153091051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93137140.

The product of its (nonzero) digits is 109350, while the sum is 43.

The spelling of 639153091051 in words is "six hundred thirty-nine billion, one hundred fifty-three million, ninety-one thousand, fifty-one".