21774454866 has 12 divisors (see below), whose sum is σ = 47177985582. Its totient is φ = 7258151616.

The previous prime is 21774454861. The next prime is 21774454909. The reversal of 21774454866 is 66845447712.

21774454866 is a `hidden beast` number, since 21 + 7 + 74 + 4 + 548 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17770223025 + 4004231841 = 133305^2 + 63279^2 .

It is a super-2 number, since 2×21774454866² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21774454861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 604845951 + ... + 604845986.

Almost surely, 2^21774454866 is an apocalyptic number.

21774454866 is an abundant number, since it is smaller than the sum of its proper divisors (25403530716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21774454866 is a wasteful number, since it uses less digits than its factorization.

21774454866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209691945 (or 1209691942 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 54.

The spelling of 21774454866 in words is "twenty-one billion, seven hundred seventy-four million, four hundred fifty-four thousand, eight hundred sixty-six".