19749272442 has 16 divisors (see below), whose sum is σ = 40338940032. Its totient is φ = 6443024960.

The previous prime is 19749272441. The next prime is 19749272443. The reversal of 19749272442 is 24427294791.

It is an interprime number because it is at equal distance from previous prime (19749272441) and next prime (19749272443).

It is not an unprimeable number, because it can be changed into a prime (19749272441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35016159 + ... + 35016722.

It is an arithmetic number, because the mean of its divisors is an integer number (2521183752).

Almost surely, 2^19749272442 is an apocalyptic number.

19749272442 is an abundant number, since it is smaller than the sum of its proper divisors (20589667590).

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

19749272442 is a wasteful number, since it uses less digits than its factorization.

19749272442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70032933.

The product of its digits is 2032128, while the sum is 51.

The spelling of 19749272442 in words is "nineteen billion, seven hundred forty-nine million, two hundred seventy-two thousand, four hundred forty-two".