39794971979553 has 20 divisors (see below), whose sum is σ = 61899606572208. Its totient is φ = 22739983984200.

The previous prime is 39794971979551. The next prime is 39794971979663. The reversal of 39794971979553 is 35597917949793.

It is a happy number.

It is not a de Polignac number, because 39794971979553 - 2¹ = 39794971979551 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 39794971979553.

It is not an unprimeable number, because it can be changed into a prime (39794971979551) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2762381523 + ... + 2762395928.

Almost surely, 2^{39794971979553} is an apocalyptic number.

It is an amenable number.

39794971979553 is a deficient number, since it is larger than the sum of its proper divisors (22104634592655).

39794971979553 is an frugal number, since it uses more digits than its factorization.

39794971979553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5524777482 (or 5524777461 counting only the distinct ones).

The product of its digits is 18228426300, while the sum is 87.

The spelling of 39794971979553 in words is "thirty-nine trillion, seven hundred ninety-four billion, nine hundred seventy-one million, nine hundred seventy-nine thousand, five hundred fifty-three".