639623067770 has 16 divisors (see below), whose sum is σ = 1152117209088. Its totient is φ = 255672407760.

The previous prime is 639623067739. The next prime is 639623067857. The reversal of 639623067770 is 77760326936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22087226 + ... + 22116165.

It is an arithmetic number, because the mean of its divisors is an integer number (72007325568).

Almost surely, 2^639623067770 is an apocalyptic number.

639623067770 is a deficient number, since it is larger than the sum of its proper divisors (512494141318).

639623067770 is a wasteful number, since it uses less digits than its factorization.

639623067770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44204845.

The product of its (nonzero) digits is 12002256, while the sum is 56.

The spelling of 639623067770 in words is "six hundred thirty-nine billion, six hundred twenty-three million, sixty-seven thousand, seven hundred seventy".