639682294049 has 8 divisors (see below), whose sum is σ = 641029479552. Its totient is φ = 638335408960.

The previous prime is 639682294037. The next prime is 639682294081. The reversal of 639682294049 is 940492286936.

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

It is a cyclic number.

It is not a de Polignac number, because 639682294049 - 2²⁰ = 639681245473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639682293982 and 639682294000.

It is not an unprimeable number, because it can be changed into a prime (639682296049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4477292 + ... + 4617954.

It is an arithmetic number, because the mean of its divisors is an integer number (80128684944).

Almost surely, 2^639682294049 is an apocalyptic number.

It is an amenable number.

639682294049 is a deficient number, since it is larger than the sum of its proper divisors (1347185503).

639682294049 is a wasteful number, since it uses less digits than its factorization.

639682294049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150207.

The product of its (nonzero) digits is 40310784, while the sum is 62.

The spelling of 639682294049 in words is "six hundred thirty-nine billion, six hundred eighty-two million, two hundred ninety-four thousand, forty-nine".