11661501666493 has 8 divisors (see below), whose sum is σ = 13526347349312. Its totient is φ = 9846385202016.

The previous prime is 11661501666431. The next prime is 11661501666569. The reversal of 11661501666493 is 39466610516611.

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 11661501666493 - 2²⁵ = 11661468112061 is a prime.

It is a super-2 number, since 2×11661501666493² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661501666293) 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, 12432304080 + ... + 12432305017.

It is an arithmetic number, because the mean of its divisors is an integer number (1690793418664).

Almost surely, 2^{11661501666493} is an apocalyptic number.

It is an amenable number.

11661501666493 is a deficient number, since it is larger than the sum of its proper divisors (1864845682819).

11661501666493 is an equidigital number, since it uses as much as digits as its factorization.

11661501666493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24864609171.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 11661501666493 in words is "eleven trillion, six hundred sixty-one billion, five hundred one million, six hundred sixty-six thousand, four hundred ninety-three".