18121976967 has 4 divisors (see below), whose sum is σ = 24162635960. Its totient is φ = 12081317976.

The previous prime is 18121976963. The next prime is 18121976969. The reversal of 18121976967 is 76967912181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18121976967 - 2² = 18121976963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121976963) 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, 3020329492 + ... + 3020329497.

It is an arithmetic number, because the mean of its divisors is an integer number (6040658990).

Almost surely, 2^18121976967 is an apocalyptic number.

18121976967 is a deficient number, since it is larger than the sum of its proper divisors (6040658993).

18121976967 is an equidigital number, since it uses as much as digits as its factorization.

18121976967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040658992.

The product of its digits is 2286144, while the sum is 57.

The spelling of 18121976967 in words is "eighteen billion, one hundred twenty-one million, nine hundred seventy-six thousand, nine hundred sixty-seven".