19494912545 has 8 divisors (see below), whose sum is σ = 23394793896. Its totient is φ = 15595330816.

The previous prime is 19494912533. The next prime is 19494912641. The reversal of 19494912545 is 54521949491.

It can be written as a sum of positive squares in 4 ways, for example, as 8418613009 + 11076299536 = 91753^2 + 105244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19494912545 - 2¹⁰ = 19494911521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109529 + ... + 225801.

It is an arithmetic number, because the mean of its divisors is an integer number (2924349237).

Almost surely, 2^19494912545 is an apocalyptic number.

It is an amenable number.

19494912545 is a deficient number, since it is larger than the sum of its proper divisors (3899881351).

19494912545 is a wasteful number, since it uses less digits than its factorization.

19494912545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149811.

The product of its digits is 2332800, while the sum is 53.

The spelling of 19494912545 in words is "nineteen billion, four hundred ninety-four million, nine hundred twelve thousand, five hundred forty-five".