18196221457 has 4 divisors (see below), whose sum is σ = 18208592896. Its totient is φ = 18183850020.

The previous prime is 18196221437. The next prime is 18196221469. The reversal of 18196221457 is 75412269181.

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 18196221457 - 2¹¹ = 18196219409 is a prime.

It is a super-2 number, since 2×18196221457² (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 (18196221427) 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, 6183513 + ... + 6186454.

It is an arithmetic number, because the mean of its divisors is an integer number (4552148224).

Almost surely, 2^18196221457 is an apocalyptic number.

It is an amenable number.

18196221457 is a deficient number, since it is larger than the sum of its proper divisors (12371439).

18196221457 is a wasteful number, since it uses less digits than its factorization.

18196221457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12371438.

The product of its digits is 241920, while the sum is 46.

The spelling of 18196221457 in words is "eighteen billion, one hundred ninety-six million, two hundred twenty-one thousand, four hundred fifty-seven".