646138762623 has 24 divisors (see below), whose sum is σ = 966162506400. Its totient is φ = 415617741504.

The previous prime is 646138762601. The next prime is 646138762639. The reversal of 646138762623 is 326267831646.

646138762623 is a `hidden beast` number, since 6 + 4 + 6 + 1 + 3 + 8 + 7 + 6 + 2 + 623 = 666.

It is not a de Polignac number, because 646138762623 - 2²⁵ = 646105208191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646138762623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646138762523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 477768 + ... + 1233101.

It is an arithmetic number, because the mean of its divisors is an integer number (40256771100).

Almost surely, 2^646138762623 is an apocalyptic number.

646138762623 is a deficient number, since it is larger than the sum of its proper divisors (320023743777).

646138762623 is a wasteful number, since it uses less digits than its factorization.

646138762623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712351 (or 1712348 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 54.

The spelling of 646138762623 in words is "six hundred forty-six billion, one hundred thirty-eight million, seven hundred sixty-two thousand, six hundred twenty-three".