1605671721475 has 24 divisors (see below), whose sum is σ = 2037802889232. Its totient is φ = 1254376905600.

The previous prime is 1605671721413. The next prime is 1605671721503. The reversal of 1605671721475 is 5741271765061.

It is not a de Polignac number, because 1605671721475 - 2²⁵ = 1605638167043 is a prime.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4583649 + ... + 4921501.

It is an arithmetic number, because the mean of its divisors is an integer number (84908453718).

Almost surely, 2^{1605671721475} is an apocalyptic number.

1605671721475 is a deficient number, since it is larger than the sum of its proper divisors (432131167757).

1605671721475 is a wasteful number, since it uses less digits than its factorization.

1605671721475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342327 (or 342322 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 52.

The spelling of 1605671721475 in words is "one trillion, six hundred five billion, six hundred seventy-one million, seven hundred twenty-one thousand, four hundred seventy-five".