19957115635 has 4 divisors (see below), whose sum is σ = 23948538768. Its totient is φ = 15965692504.

The previous prime is 19957115621. The next prime is 19957115653. The reversal of 19957115635 is 53651175991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19957115635 - 2¹¹ = 19957113587 is a prime.

It is a super-2 number, since 2×19957115635² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995711559 + ... + 1995711568.

It is an arithmetic number, because the mean of its divisors is an integer number (5987134692).

Almost surely, 2^19957115635 is an apocalyptic number.

19957115635 is a deficient number, since it is larger than the sum of its proper divisors (3991423133).

19957115635 is an equidigital number, since it uses as much as digits as its factorization.

19957115635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991423132.

The product of its digits is 1275750, while the sum is 52.

The spelling of 19957115635 in words is "nineteen billion, nine hundred fifty-seven million, one hundred fifteen thousand, six hundred thirty-five".