13965557761 has 4 divisors (see below), whose sum is σ = 13979078212. Its totient is φ = 13952037312.

The previous prime is 13965557743. The next prime is 13965557773. The reversal of 13965557761 is 16775556931.

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 12464382736 + 1501175025 = 111644^2 + 38745^2 .

It is a cyclic number.

It is not a de Polignac number, because 13965557761 - 2¹⁷ = 13965426689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13965557161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6758676 + ... + 6760741.

It is an arithmetic number, because the mean of its divisors is an integer number (3494769553).

Almost surely, 2^13965557761 is an apocalyptic number.

It is an amenable number.

13965557761 is a deficient number, since it is larger than the sum of its proper divisors (13520451).

13965557761 is a wasteful number, since it uses less digits than its factorization.

13965557761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13520450.

The product of its digits is 5953500, while the sum is 55.

The spelling of 13965557761 in words is "thirteen billion, nine hundred sixty-five million, five hundred fifty-seven thousand, seven hundred sixty-one".