11666600551550 has 96 divisors (see below), whose sum is σ = 25578287170560. Its totient is φ = 3876109776000.

The previous prime is 11666600551537. The next prime is 11666600551559. The reversal of 11666600551550 is 5515500666611.

It is a super-2 number, since 2×11666600551550² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a junction number, because it is equal to n+sod(n) for n = 11666600551495 and 11666600551504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666600551559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1849520 + ... + 5172419.

It is an arithmetic number, because the mean of its divisors is an integer number (266440491360).

Almost surely, 2^{11666600551550} is an apocalyptic number.

11666600551550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11666600551550 is an abundant number, since it is smaller than the sum of its proper divisors (13911686619010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11666600551550 is a wasteful number, since it uses less digits than its factorization.

11666600551550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7022106 (or 7022101 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 11666600551550 in words is "eleven trillion, six hundred sixty-six billion, six hundred million, five hundred fifty-one thousand, five hundred fifty".