18692472961 has 4 divisors (see below), whose sum is σ = 19792030212. Its totient is φ = 17592915712.

The previous prime is 18692472949. The next prime is 18692472971. The reversal of 18692472961 is 16927429681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16927429681 = 3547 ⋅4772323.

It can be written as a sum of positive squares in 2 ways, for example, as 10333942336 + 8358530625 = 101656^2 + 91425^2 .

It is a cyclic number.

It is not a de Polignac number, because 18692472961 - 2²⁵ = 18658918529 is a prime.

It is a super-2 number, since 2×18692472961² (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 (18692472941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549778600 + ... + 549778633.

It is an arithmetic number, because the mean of its divisors is an integer number (4948007553).

Almost surely, 2^18692472961 is an apocalyptic number.

It is an amenable number.

18692472961 is a deficient number, since it is larger than the sum of its proper divisors (1099557251).

18692472961 is a wasteful number, since it uses less digits than its factorization.

18692472961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099557250.

The product of its digits is 2612736, while the sum is 55.

The spelling of 18692472961 in words is "eighteen billion, six hundred ninety-two million, four hundred seventy-two thousand, nine hundred sixty-one".