15551661711 has 4 divisors (see below), whose sum is σ = 20735548952. Its totient is φ = 10367774472.

The previous prime is 15551661707. The next prime is 15551661737. The reversal of 15551661711 is 11716615551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15551661711 - 2² = 15551661707 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 15551661711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551661701) 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, 2591943616 + ... + 2591943621.

It is an arithmetic number, because the mean of its divisors is an integer number (5183887238).

Almost surely, 2^15551661711 is an apocalyptic number.

15551661711 is a deficient number, since it is larger than the sum of its proper divisors (5183887241).

15551661711 is an equidigital number, since it uses as much as digits as its factorization.

15551661711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183887240.

The product of its digits is 31500, while the sum is 39.

The spelling of 15551661711 in words is "fifteen billion, five hundred fifty-one million, six hundred sixty-one thousand, seven hundred eleven".