623657978091 has 24 divisors (see below), whose sum is σ = 934295025664. Its totient is φ = 415731349800.

The previous prime is 623657978057. The next prime is 623657978093. The reversal of 623657978091 is 190879756326.

It is not a de Polignac number, because 623657978091 - 2¹¹ = 623657976043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623657978093) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2476866 + ... + 2717016.

Almost surely, 2^623657978091 is an apocalyptic number.

623657978091 is a deficient number, since it is larger than the sum of its proper divisors (310637047573).

623657978091 is a wasteful number, since it uses less digits than its factorization.

623657978091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250853 (or 250841 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 63.

The spelling of 623657978091 in words is "six hundred twenty-three billion, six hundred fifty-seven million, nine hundred seventy-eight thousand, ninety-one".