1605661725057 has 12 divisors (see below), whose sum is σ = 2318233497264. Its totient is φ = 988099522800.

The previous prime is 1605661725047. The next prime is 1605661725079. The reversal of 1605661725057 is 7505271665061.

It is not a de Polignac number, because 1605661725057 - 2¹⁵ = 1605661692289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1605661725037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1583492319 + ... + 1583493332.

It is an arithmetic number, because the mean of its divisors is an integer number (193186124772).

Almost surely, 2^{1605661725057} is an apocalyptic number.

It is an amenable number.

1605661725057 is a deficient number, since it is larger than the sum of its proper divisors (712571772207).

1605661725057 is a wasteful number, since it uses less digits than its factorization.

1605661725057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166985680 (or 3166985667 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 51.

The spelling of 1605661725057 in words is "one trillion, six hundred five billion, six hundred sixty-one million, seven hundred twenty-five thousand, fifty-seven".