18479497461 has 4 divisors (see below), whose sum is σ = 24639329952. Its totient is φ = 12319664972.

The previous prime is 18479497457. The next prime is 18479497469. The reversal of 18479497461 is 16479497481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18479497461 - 2² = 18479497457 is a prime.

It is a super-2 number, since 2×18479497461² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18479497395 and 18479497404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18479497469) 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, 3079916241 + ... + 3079916246.

It is an arithmetic number, because the mean of its divisors is an integer number (6159832488).

Almost surely, 2^18479497461 is an apocalyptic number.

It is an amenable number.

18479497461 is a deficient number, since it is larger than the sum of its proper divisors (6159832491).

18479497461 is an equidigital number, since it uses as much as digits as its factorization.

18479497461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6159832490.

The product of its digits is 12192768, while the sum is 60.

The spelling of 18479497461 in words is "eighteen billion, four hundred seventy-nine million, four hundred ninety-seven thousand, four hundred sixty-one".