19992400722 has 210 divisors, whose sum is σ = 54680528583. Its totient is φ = 5463761688.

The previous prime is 19992400679. The next prime is 19992400733. The reversal of 19992400722 is 22700429991.

19992400722 is a `hidden beast` number, since 1 + 99 + 92 + 400 + 72 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9996200361 + 9996200361 = 99981^2 + 99981^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99981.

It is a super-2 number, since 2×19992400722² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 869234803 + ... + 869234825.

Almost surely, 2^19992400722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19992400722

19992400722 is an abundant number, since it is smaller than the sum of its proper divisors (34688127861).

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

19992400722 is an frugal number, since it uses more digits than its factorization.

19992400722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 19992400722 in words is "nineteen billion, nine hundred ninety-two million, four hundred thousand, seven hundred twenty-two".