19775717545 has 8 divisors (see below), whose sum is σ = 23741482824. Its totient is φ = 15813492864.

The previous prime is 19775717537. The next prime is 19775717573. The reversal of 19775717545 is 54571757791.

It can be written as a sum of positive squares in 4 ways, for example, as 7380012649 + 12395704896 = 85907^2 + 111336^2 .

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 19775717545 - 2³ = 19775717537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19775717545.

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, 872844 + ... + 895213.

It is an arithmetic number, because the mean of its divisors is an integer number (2967685353).

Almost surely, 2^19775717545 is an apocalyptic number.

It is an amenable number.

19775717545 is a deficient number, since it is larger than the sum of its proper divisors (3965765279).

19775717545 is a wasteful number, since it uses less digits than its factorization.

19775717545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770299.

The product of its digits is 10804500, while the sum is 58.

The spelling of 19775717545 in words is "nineteen billion, seven hundred seventy-five million, seven hundred seventeen thousand, five hundred forty-five".