19645385697 has 48 divisors (see below), whose sum is σ = 33569303040. Its totient is φ = 10832201856.

The previous prime is 19645385693. The next prime is 19645385699. The reversal of 19645385697 is 79658354691.

19645385697 is a `hidden beast` number, since 1 + 9 + 6 + 4 + 538 + 5 + 6 + 97 = 666.

It is not a de Polignac number, because 19645385697 - 2² = 19645385693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19645385693) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5521243 + ... + 5524799.

It is an arithmetic number, because the mean of its divisors is an integer number (699360480).

Almost surely, 2^19645385697 is an apocalyptic number.

It is an amenable number.

19645385697 is a deficient number, since it is larger than the sum of its proper divisors (13923917343).

19645385697 is a wasteful number, since it uses less digits than its factorization.

19645385697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622 (or 6619 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 19645385697 in words is "nineteen billion, six hundred forty-five million, three hundred eighty-five thousand, six hundred ninety-seven".