11615561023 has 16 divisors (see below), whose sum is σ = 13798396800. Its totient is φ = 9658867680.

The previous prime is 11615561017. The next prime is 11615561033. The reversal of 11615561023 is 32016551611.

It is a happy number.

It is not a de Polignac number, because 11615561023 - 2¹³ = 11615552831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11615561003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 952161 + ... + 964282.

It is an arithmetic number, because the mean of its divisors is an integer number (862399800).

Almost surely, 2^11615561023 is an apocalyptic number.

11615561023 is a deficient number, since it is larger than the sum of its proper divisors (2182835777).

11615561023 is a wasteful number, since it uses less digits than its factorization.

11615561023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916502.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 11615561023 in words is "eleven billion, six hundred fifteen million, five hundred sixty-one thousand, twenty-three".