19745852861 has 6 divisors (see below), whose sum is σ = 22969665630. Its totient is φ = 16925016696.

The previous prime is 19745852857. The next prime is 19745852879. The reversal of 19745852861 is 16825854791.

It can be written as a sum of positive squares in only one way, i.e., 17396027236 + 2349825625 = 131894^2 + 48475^2 .

It is not a de Polignac number, because 19745852861 - 2² = 19745852857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19745852797 and 19745852806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19745852261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201488246 + ... + 201488343.

It is an arithmetic number, because the mean of its divisors is an integer number (3828277605).

Almost surely, 2^19745852861 is an apocalyptic number.

It is an amenable number.

19745852861 is a deficient number, since it is larger than the sum of its proper divisors (3223812769).

19745852861 is an equidigital number, since it uses as much as digits as its factorization.

19745852861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402976603 (or 402976596 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 56.

The spelling of 19745852861 in words is "nineteen billion, seven hundred forty-five million, eight hundred fifty-two thousand, eight hundred sixty-one".