19747062081 has 12 divisors (see below), whose sum is σ = 29061714708. Its totient is φ = 12916317024.

The previous prime is 19747062077. The next prime is 19747062109. The reversal of 19747062081 is 18026074791.

It is a happy number.

19747062081 is a `hidden beast` number, since 19 + 7 + 4 + 7 + 0 + 620 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12371000625 + 7376061456 = 111225^2 + 85884^2 .

It is not a de Polignac number, because 19747062081 - 2² = 19747062077 is a prime.

It is a super-2 number, since 2×19747062081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19747062001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20698750 + ... + 20699703.

It is an arithmetic number, because the mean of its divisors is an integer number (2421809559).

Almost surely, 2^19747062081 is an apocalyptic number.

It is an amenable number.

19747062081 is a deficient number, since it is larger than the sum of its proper divisors (9314652627).

19747062081 is a wasteful number, since it uses less digits than its factorization.

19747062081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41398512 (or 41398509 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 19747062081 in words is "nineteen billion, seven hundred forty-seven million, sixty-two thousand, eighty-one".