11992551655 has 32 divisors (see below), whose sum is σ = 17976176640. Its totient is φ = 7490050560.

The previous prime is 11992551643. The next prime is 11992551661. The reversal of 11992551655 is 55615529911.

It is not a de Polignac number, because 11992551655 - 2²¹ = 11990454503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11992551599 and 11992551608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306645 + ... + 343534.

It is an arithmetic number, because the mean of its divisors is an integer number (561755520).

Almost surely, 2^11992551655 is an apocalyptic number.

11992551655 is a deficient number, since it is larger than the sum of its proper divisors (5983624985).

11992551655 is a wasteful number, since it uses less digits than its factorization.

11992551655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650239.

The product of its digits is 607500, while the sum is 49.

The spelling of 11992551655 in words is "eleven billion, nine hundred ninety-two million, five hundred fifty-one thousand, six hundred fifty-five".