11661165006551 has 4 divisors (see below), whose sum is σ = 11661789585504. Its totient is φ = 11660540427600.

The previous prime is 11661165006527. The next prime is 11661165006581. The reversal of 11661165006551 is 15560056116611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11661165006551 - 2²² = 11661160812247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661165006581) 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 3 ways as a sum of consecutive naturals, for example, 312261470 + ... + 312298811.

It is an arithmetic number, because the mean of its divisors is an integer number (2915447396376).

Almost surely, 2^{11661165006551} is an apocalyptic number.

11661165006551 is a deficient number, since it is larger than the sum of its proper divisors (624578953).

11661165006551 is an equidigital number, since it uses as much as digits as its factorization.

11661165006551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624578952.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 11661165006551 in words is "eleven trillion, six hundred sixty-one billion, one hundred sixty-five million, six thousand, five hundred fifty-one".