19734942545 has 4 divisors (see below), whose sum is σ = 23681931060. Its totient is φ = 15787954032.

The previous prime is 19734942533. The next prime is 19734942551. The reversal of 19734942545 is 54524943791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5159692561 + 14575249984 = 71831^2 + 120728^2 .

It is a cyclic number.

It is not a de Polignac number, because 19734942545 - 2²⁴ = 19718165329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1973494250 + ... + 1973494259.

It is an arithmetic number, because the mean of its divisors is an integer number (5920482765).

Almost surely, 2^19734942545 is an apocalyptic number.

It is an amenable number.

19734942545 is a deficient number, since it is larger than the sum of its proper divisors (3946988515).

19734942545 is an equidigital number, since it uses as much as digits as its factorization.

19734942545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946988514.

The product of its digits is 5443200, while the sum is 53.

The spelling of 19734942545 in words is "nineteen billion, seven hundred thirty-four million, nine hundred forty-two thousand, five hundred forty-five".