11661156505053 has 12 divisors (see below), whose sum is σ = 18375155705088. Its totient is φ = 7067367578760.

The previous prime is 11661156505049. The next prime is 11661156505079. The reversal of 11661156505053 is 35050565116611.

11661156505053 is a `hidden beast` number, since 1 + 16 + 61 + 15 + 65 + 0 + 505 + 3 = 666.

It is not a de Polignac number, because 11661156505053 - 2² = 11661156505049 is a prime.

It is a super-2 number, since 2×11661156505053² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661156505553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58894729725 + ... + 58894729922.

It is an arithmetic number, because the mean of its divisors is an integer number (1531262975424).

Almost surely, 2^{11661156505053} is an apocalyptic number.

It is an amenable number.

11661156505053 is a deficient number, since it is larger than the sum of its proper divisors (6713999200035).

11661156505053 is a wasteful number, since it uses less digits than its factorization.

11661156505053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117789459664 (or 117789459661 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 45.

The spelling of 11661156505053 in words is "eleven trillion, six hundred sixty-one billion, one hundred fifty-six million, five hundred five thousand, fifty-three".