11666155560551 has 4 divisors (see below), whose sum is σ = 11666708768400. Its totient is φ = 11665602352704.

The previous prime is 11666155560509. The next prime is 11666155560559. The reversal of 11666155560551 is 15506555166611.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11666155560551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11666155560493 and 11666155560502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666155560559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276572291 + ... + 276614468.

It is an arithmetic number, because the mean of its divisors is an integer number (2916677192100).

Almost surely, 2^{11666155560551} is an apocalyptic number.

11666155560551 is a deficient number, since it is larger than the sum of its proper divisors (553207849).

11666155560551 is an equidigital number, since it uses as much as digits as its factorization.

11666155560551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553207848.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 11666155560551 in words is "eleven trillion, six hundred sixty-six billion, one hundred fifty-five million, five hundred sixty thousand, five hundred fifty-one".