642899756367 has 36 divisors (see below), whose sum is σ = 1048316145240. Its totient is φ = 379105483680.

The previous prime is 642899756353. The next prime is 642899756407. The reversal of 642899756367 is 763657998246.

642899756367 is a `hidden beast` number, since 6 + 428 + 9 + 97 + 56 + 3 + 67 = 666.

It is not a de Polignac number, because 642899756367 - 2¹⁶ = 642899690831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642899756295 and 642899756304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642899756347) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7937517 + ... + 8018102.

Almost surely, 2^642899756367 is an apocalyptic number.

642899756367 is a deficient number, since it is larger than the sum of its proper divisors (405416388873).

642899756367 is a wasteful number, since it uses less digits than its factorization.

642899756367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15955684 (or 15955670 counting only the distinct ones).

The product of its digits is 823011840, while the sum is 72.

The spelling of 642899756367 in words is "six hundred forty-two billion, eight hundred ninety-nine million, seven hundred fifty-six thousand, three hundred sixty-seven".