78623537013 has 24 divisors (see below), whose sum is σ = 129873598400. Its totient is φ = 44899225344.

The previous prime is 78623536991. The next prime is 78623537051. The reversal of 78623537013 is 31073532687.

78623537013 is a `hidden beast` number, since 7 + 8 + 623 + 5 + 3 + 7 + 0 + 13 = 666.

It is not a de Polignac number, because 78623537013 - 2⁶ = 78623536949 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78623537013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78623537513) 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, 295708 + ... + 494661.

Almost surely, 2^78623537013 is an apocalyptic number.

It is an amenable number.

78623537013 is a deficient number, since it is larger than the sum of its proper divisors (51250061387).

78623537013 is a wasteful number, since it uses less digits than its factorization.

78623537013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791961 (or 791958 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 78623537013 in words is "seventy-eight billion, six hundred twenty-three million, five hundred thirty-seven thousand, thirteen".