19797137802 has 32 divisors (see below), whose sum is σ = 47377767360. Its totient is φ = 6091426800.

The previous prime is 19797137797. The next prime is 19797137803. The reversal of 19797137802 is 20873179791.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19797137803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14099824 + ... + 14101227.

It is an arithmetic number, because the mean of its divisors is an integer number (1480555230).

Almost surely, 2^19797137802 is an apocalyptic number.

19797137802 is an abundant number, since it is smaller than the sum of its proper divisors (27580629558).

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

19797137802 is a wasteful number, since it uses less digits than its factorization.

19797137802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28201075 (or 28201069 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The spelling of 19797137802 in words is "nineteen billion, seven hundred ninety-seven million, one hundred thirty-seven thousand, eight hundred two".