1661255623325 has 48 divisors (see below), whose sum is σ = 2133634867200. Its totient is φ = 1281769944000.

The previous prime is 1661255623301. The next prime is 1661255623327. The reversal of 1661255623325 is 5233265521661.

It is a de Polignac number, because none of the positive numbers 2^k-1661255623325 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1661255623325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661255623327) 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, 300350810 + ... + 300356340.

It is an arithmetic number, because the mean of its divisors is an integer number (44450726400).

Almost surely, 2^{1661255623325} is an apocalyptic number.

It is an amenable number.

1661255623325 is a deficient number, since it is larger than the sum of its proper divisors (472379243875).

1661255623325 is a wasteful number, since it uses less digits than its factorization.

1661255623325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6818 (or 6813 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 47.

The spelling of 1661255623325 in words is "one trillion, six hundred sixty-one billion, two hundred fifty-five million, six hundred twenty-three thousand, three hundred twenty-five".