19802220451 has 16 divisors (see below), whose sum is σ = 22700109600. Its totient is φ = 17122330368.

The previous prime is 19802220421. The next prime is 19802220523. The reversal of 19802220451 is 15402220891.

It is a de Polignac number, because none of the positive numbers 2^k-19802220451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19802220421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 428416 + ... + 472381.

It is an arithmetic number, because the mean of its divisors is an integer number (1418756850).

Almost surely, 2^19802220451 is an apocalyptic number.

19802220451 is a deficient number, since it is larger than the sum of its proper divisors (2897889149).

19802220451 is a wasteful number, since it uses less digits than its factorization.

19802220451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900918.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 19802220451 in words is "nineteen billion, eight hundred two million, two hundred twenty thousand, four hundred fifty-one".