639267422705 has 8 divisors (see below), whose sum is σ = 781594886952. Its totient is φ = 501764618368.

The previous prime is 639267422683. The next prime is 639267422753. The reversal of 639267422705 is 507224762936.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 103607378161 + 535660044544 = 321881^2 + 731888^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639267422705 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206164684 + ... + 1206165213.

It is an arithmetic number, because the mean of its divisors is an integer number (97699360869).

Almost surely, 2^639267422705 is an apocalyptic number.

It is an amenable number.

639267422705 is a deficient number, since it is larger than the sum of its proper divisors (142327464247).

639267422705 is a wasteful number, since it uses less digits than its factorization.

639267422705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412329955.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 639267422705 in words is "six hundred thirty-nine billion, two hundred sixty-seven million, four hundred twenty-two thousand, seven hundred five".