3551551165566 has 20 divisors (see below), whose sum is σ = 7958105389872. Its totient is φ = 1183850388468.

The previous prime is 3551551165511. The next prime is 3551551165571. The reversal of 3551551165566 is 6655611551553.

3551551165566 is a `hidden beast` number, since 3 + 5 + 5 + 1 + 5 + 5 + 11 + 65 + 566 = 666.

It is a super-2 number, since 2×3551551165566² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 10961577510 + ... + 10961577833.

Almost surely, 2^{3551551165566} is an apocalyptic number.

3551551165566 is an abundant number, since it is smaller than the sum of its proper divisors (4406554224306).

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

3551551165566 is a wasteful number, since it uses less digits than its factorization.

3551551165566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21923155357 (or 21923155348 counting only the distinct ones).

The product of its digits is 10125000, while the sum is 54.

The spelling of 3551551165566 in words is "three trillion, five hundred fifty-one billion, five hundred fifty-one million, one hundred sixty-five thousand, five hundred sixty-six".