11661534031 has 32 divisors (see below), whose sum is σ = 14195916800. Its totient is φ = 9357210720.

The previous prime is 11661534023. The next prime is 11661534041. The reversal of 11661534031 is 13043516611.

It is a cyclic number.

It is not a de Polignac number, because 11661534031 - 2³ = 11661534023 is a prime.

It is a super-2 number, since 2×11661534031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11661533984 and 11661534002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661534041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11766946 + ... + 11767936.

It is an arithmetic number, because the mean of its divisors is an integer number (443622400).

Almost surely, 2^11661534031 is an apocalyptic number.

11661534031 is a deficient number, since it is larger than the sum of its proper divisors (2534382769).

11661534031 is a wasteful number, since it uses less digits than its factorization.

11661534031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 11661534031 in words is "eleven billion, six hundred sixty-one million, five hundred thirty-four thousand, thirty-one".