11500061661 has 96 divisors (see below), whose sum is σ = 19431899136. Its totient is φ = 6488208000.

The previous prime is 11500061659. The next prime is 11500061693. The reversal of 11500061661 is 16616000511.

It is not a de Polignac number, because 11500061661 - 2¹ = 11500061659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11500061611) 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 95 ways as a sum of consecutive naturals, for example, 8798170 + ... + 8799476.

It is an arithmetic number, because the mean of its divisors is an integer number (202415616).

Almost surely, 2^11500061661 is an apocalyptic number.

11500061661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11500061661 is a deficient number, since it is larger than the sum of its proper divisors (7931837475).

11500061661 is a wasteful number, since it uses less digits than its factorization.

11500061661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463 (or 1460 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 11500061661 in words is "eleven billion, five hundred million, sixty-one thousand, six hundred sixty-one".