11661161605501 has 8 divisors (see below), whose sum is σ = 11840624349120. Its totient is φ = 11483004045888.

The previous prime is 11661161605459. The next prime is 11661161605519. The reversal of 11661161605501 is 10550616116611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11661161605501 - 2²⁹ = 11660624734589 is a prime.

It is a super-2 number, since 2×11661161605501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661161605601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326277996 + ... + 326313733.

It is an arithmetic number, because the mean of its divisors is an integer number (1480078043640).

Almost surely, 2^{11661161605501} is an apocalyptic number.

It is an amenable number.

11661161605501 is a deficient number, since it is larger than the sum of its proper divisors (179462743619).

11661161605501 is a wasteful number, since it uses less digits than its factorization.

11661161605501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652592003.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 11661161605501 in words is "eleven trillion, six hundred sixty-one billion, one hundred sixty-one million, six hundred five thousand, five hundred one".