18154293961 has 2 divisors, whose sum is σ = 18154293962. Its totient is φ = 18154293960.

The previous prime is 18154293919. The next prime is 18154293977. The reversal of 18154293961 is 16939245181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14530855936 + 3623438025 = 120544^2 + 60195^2 .

It is a cyclic number.

It is not a de Polignac number, because 18154293961 - 2¹¹ = 18154291913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18154293991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9077146980 + 9077146981.

It is an arithmetic number, because the mean of its divisors is an integer number (9077146981).

Almost surely, 2^18154293961 is an apocalyptic number.

It is an amenable number.

18154293961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18154293961 is an equidigital number, since it uses as much as digits as its factorization.

18154293961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The spelling of 18154293961 in words is "eighteen billion, one hundred fifty-four million, two hundred ninety-three thousand, nine hundred sixty-one".