639786750207373 has 4 divisors (see below), whose sum is σ = 639791211499708. Its totient is φ = 639782288915040.

The previous prime is 639786750207317. The next prime is 639786750207391. The reversal of 639786750207373 is 373702057687936.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 582690017494729 + 57096732712644 = 24138973^2 + 7556238^2 .

It is a cyclic number.

It is not a de Polignac number, because 639786750207373 - 2¹⁷ = 639786750076301 is a prime.

It is a super-2 number, since 2×639786750207373² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639786750207296 and 639786750207305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639786750237373) 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, 2230431048 + ... + 2230717873.

It is an arithmetic number, because the mean of its divisors is an integer number (159947802874927).

Almost surely, 2^{639786750207373} is an apocalyptic number.

It is an amenable number.

639786750207373 is a deficient number, since it is larger than the sum of its proper divisors (4461292335).

639786750207373 is a wasteful number, since it uses less digits than its factorization.

639786750207373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4461292334.

The product of its (nonzero) digits is 1680315840, while the sum is 73.

The spelling of 639786750207373 in words is "six hundred thirty-nine trillion, seven hundred eighty-six billion, seven hundred fifty million, two hundred seven thousand, three hundred seventy-three".