20016566451 has 32 divisors (see below), whose sum is σ = 33982945280. Its totient is φ = 11406832128.

The previous prime is 20016566429. The next prime is 20016566473. The reversal of 20016566451 is 15466561002.

20016566451 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 6 + 5 + 6 + 645 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (20016566429) and next prime (20016566473).

It is not a de Polignac number, because 20016566451 - 2⁹ = 20016565939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20016566851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74926 + ... + 213651.

It is an arithmetic number, because the mean of its divisors is an integer number (1061967040).

Almost surely, 2^20016566451 is an apocalyptic number.

20016566451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20016566451 is a deficient number, since it is larger than the sum of its proper divisors (13966378829).

20016566451 is a wasteful number, since it uses less digits than its factorization.

20016566451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288960 (or 288954 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 20016566451 in words is "twenty billion, sixteen million, five hundred sixty-six thousand, four hundred fifty-one".