19977198072 has 64 divisors (see below), whose sum is σ = 53940055680. Its totient is φ = 6129082752.

The previous prime is 19977198061. The next prime is 19977198091. The reversal of 19977198072 is 27089177991.

It is a junction number, because it is equal to n+sod(n) for n = 19977197997 and 19977198015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16003 + ... + 200525.

It is an arithmetic number, because the mean of its divisors is an integer number (842813370).

Almost surely, 2^19977198072 is an apocalyptic number.

19977198072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19977198072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26970027840).

19977198072 is an abundant number, since it is smaller than the sum of its proper divisors (33962857608).

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

19977198072 is a wasteful number, since it uses less digits than its factorization.

19977198072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184892 (or 184888 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 60.

The spelling of 19977198072 in words is "nineteen billion, nine hundred seventy-seven million, one hundred ninety-eight thousand, seventy-two".