19635073081 has 16 divisors (see below), whose sum is σ = 22678367040. Its totient is φ = 16846764480.

The previous prime is 19635073069. The next prime is 19635073099. The reversal of 19635073081 is 18037053691.

It is not a de Polignac number, because 19635073081 - 2²⁵ = 19601518649 is a prime.

It is a super-2 number, since 2×19635073081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19635073781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736855 + ... + 763036.

It is an arithmetic number, because the mean of its divisors is an integer number (1417397940).

Almost surely, 2^19635073081 is an apocalyptic number.

It is an amenable number.

19635073081 is a deficient number, since it is larger than the sum of its proper divisors (3043293959).

19635073081 is a wasteful number, since it uses less digits than its factorization.

19635073081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499976.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 19635073081 in words is "nineteen billion, six hundred thirty-five million, seventy-three thousand, eighty-one".