639312026551 has 32 divisors (see below), whose sum is σ = 714769920000. Its totient is φ = 566877991680.

The previous prime is 639312026513. The next prime is 639312026557. The reversal of 639312026551 is 155620213936.

It is not a de Polignac number, because 639312026551 - 2³⁵ = 604952288183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639312026498 and 639312026507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639312026557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266489850 + ... + 266492248.

It is an arithmetic number, because the mean of its divisors is an integer number (22336560000).

Almost surely, 2^639312026551 is an apocalyptic number.

639312026551 is a deficient number, since it is larger than the sum of its proper divisors (75457893449).

639312026551 is a wasteful number, since it uses less digits than its factorization.

639312026551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 639312026551 in words is "six hundred thirty-nine billion, three hundred twelve million, twenty-six thousand, five hundred fifty-one".