1551110556666 has 16 divisors (see below), whose sum is σ = 3384241214688. Its totient is φ = 470033502000.

The previous prime is 1551110556659. The next prime is 1551110556713. The reversal of 1551110556666 is 6666550111551.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11750837485 + ... + 11750837616.

It is an arithmetic number, because the mean of its divisors is an integer number (211515075918).

Almost surely, 2^{1551110556666} is an apocalyptic number.

1551110556666 is an abundant number, since it is smaller than the sum of its proper divisors (1833130658022).

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

1551110556666 is a wasteful number, since it uses less digits than its factorization.

1551110556666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23501675117.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 1551110556666 in words is "one trillion, five hundred fifty-one billion, one hundred ten million, five hundred fifty-six thousand, six hundred sixty-six".