654318897961 has 2 divisors, whose sum is σ = 654318897962. Its totient is φ = 654318897960.

The previous prime is 654318897959. The next prime is 654318897977. The reversal of 654318897961 is 169798813456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610656288025 + 43662609936 = 781445^2 + 208956^2 .

It is a cyclic number.

It is not a de Polignac number, because 654318897961 - 2¹ = 654318897959 is a prime.

Together with 654318897959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (654318897061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327159448980 + 327159448981.

It is an arithmetic number, because the mean of its divisors is an integer number (327159448981).

Almost surely, 2^654318897961 is an apocalyptic number.

It is an amenable number.

654318897961 is a deficient number, since it is larger than the sum of its proper divisors (1).

654318897961 is an equidigital number, since it uses as much as digits as its factorization.

654318897961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78382080, while the sum is 67.

The spelling of 654318897961 in words is "six hundred fifty-four billion, three hundred eighteen million, eight hundred ninety-seven thousand, nine hundred sixty-one".