1610665665556 has 12 divisors (see below), whose sum is σ = 2915860256820. Its totient is φ = 777562735040.

The previous prime is 1610665665529. The next prime is 1610665665577. The reversal of 1610665665556 is 6555665660161.

It can be written as a sum of positive squares in 2 ways, for example, as 1231167776400 + 379497889156 = 1109580^2 + 616034^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 1610665665556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6942524305 + ... + 6942524536.

It is an arithmetic number, because the mean of its divisors is an integer number (242988354735).

Almost surely, 2^{1610665665556} is an apocalyptic number.

It is an amenable number.

1610665665556 is a deficient number, since it is larger than the sum of its proper divisors (1305194591264).

1610665665556 is a wasteful number, since it uses less digits than its factorization.

1610665665556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13885048874 (or 13885048872 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 58.

The spelling of 1610665665556 in words is "one trillion, six hundred ten billion, six hundred sixty-five million, six hundred sixty-five thousand, five hundred fifty-six".