1605422605725 has 36 divisors (see below), whose sum is σ = 2876350741056. Its totient is φ = 855969169440.

The previous prime is 1605422605691. The next prime is 1605422605727. The reversal of 1605422605725 is 5275062245061.

1605422605725 is a `hidden beast` number, since 1 + 6 + 0 + 54 + 2 + 26 + 0 + 572 + 5 = 666.

It is not a de Polignac number, because 1605422605725 - 2²⁵ = 1605389051293 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605422605727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 312837 + ... + 1818986.

It is an arithmetic number, because the mean of its divisors is an integer number (79898631696).

Almost surely, 2^{1605422605725} is an apocalyptic number.

1605422605725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605422605725 is a deficient number, since it is larger than the sum of its proper divisors (1270928135331).

1605422605725 is a wasteful number, since it uses less digits than its factorization.

1605422605725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135186 (or 2135178 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 1605422605725 in words is "one trillion, six hundred five billion, four hundred twenty-two million, six hundred five thousand, seven hundred twenty-five".