11661451653 has 16 divisors (see below), whose sum is σ = 15991153920. Its totient is φ = 7553612736.

The previous prime is 11661451601. The next prime is 11661451661. The reversal of 11661451653 is 35615416611.

It is not a de Polignac number, because 11661451653 - 2¹⁰ = 11661450629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661451553) 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, 6751 + ... + 152867.

It is an arithmetic number, because the mean of its divisors is an integer number (999447120).

Almost surely, 2^11661451653 is an apocalyptic number.

It is an amenable number.

11661451653 is a deficient number, since it is larger than the sum of its proper divisors (4329702267).

11661451653 is a wasteful number, since it uses less digits than its factorization.

11661451653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146876.

The product of its digits is 64800, while the sum is 39.

The spelling of 11661451653 in words is "eleven billion, six hundred sixty-one million, four hundred fifty-one thousand, six hundred fifty-three".