19955565707 has 12 divisors (see below), whose sum is σ = 25323946776. Its totient is φ = 15549791040.

The previous prime is 19955565691. The next prime is 19955565761. The reversal of 19955565707 is 70756555991.

It is a happy number.

It is not a de Polignac number, because 19955565707 - 2⁴ = 19955565691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19955567707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18511118 + ... + 18512195.

It is an arithmetic number, because the mean of its divisors is an integer number (2110328898).

Almost surely, 2^19955565707 is an apocalyptic number.

19955565707 is a deficient number, since it is larger than the sum of its proper divisors (5368381069).

19955565707 is a wasteful number, since it uses less digits than its factorization.

19955565707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37023338 (or 37023331 counting only the distinct ones).

The product of its (nonzero) digits is 14883750, while the sum is 59.

The spelling of 19955565707 in words is "nineteen billion, nine hundred fifty-five million, five hundred sixty-five thousand, seven hundred seven".