11390865985 has 8 divisors (see below), whose sum is σ = 13760778600. Its totient is φ = 9051533184.

The previous prime is 11390865979. The next prime is 11390866013. The reversal of 11390865985 is 58956809311.

It is a Cunningham number, because it is equal to 106728²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1334587024 + 10056278961 = 36532^2 + 100281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11390865985 - 2³ = 11390865977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7644132 + ... + 7645621.

It is an arithmetic number, because the mean of its divisors is an integer number (1720097325).

Almost surely, 2^11390865985 is an apocalyptic number.

It is an amenable number.

11390865985 is a deficient number, since it is larger than the sum of its proper divisors (2369912615).

11390865985 is a wasteful number, since it uses less digits than its factorization.

11390865985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15289907.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 11390865985 in words is "eleven billion, three hundred ninety million, eight hundred sixty-five thousand, nine hundred eighty-five".