1551665005566 has 64 divisors (see below), whose sum is σ = 3423145017600. Its totient is φ = 465966498816.

The previous prime is 1551665005489. The next prime is 1551665005577. The reversal of 1551665005566 is 6655005661551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 573171 + ... + 1852526.

It is an arithmetic number, because the mean of its divisors is an integer number (53486640900).

Almost surely, 2^{1551665005566} is an apocalyptic number.

1551665005566 is an abundant number, since it is smaller than the sum of its proper divisors (1871480012034).

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

1551665005566 is a wasteful number, since it uses less digits than its factorization.

1551665005566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425913.

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 1551665005566 in words is "one trillion, five hundred fifty-one billion, six hundred sixty-five million, five thousand, five hundred sixty-six".