1606401725501 has 4 divisors (see below), whose sum is σ = 1606428696252. Its totient is φ = 1606374754752.

The previous prime is 1606401725483. The next prime is 1606401725543. The reversal of 1606401725501 is 1055271046061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534286440601 + 1072115284900 = 730949^2 + 1035430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606401725501 - 2⁶ = 1606401725437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606401728501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13395836 + ... + 13515221.

It is an arithmetic number, because the mean of its divisors is an integer number (401607174063).

Almost surely, 2^{1606401725501} is an apocalyptic number.

It is an amenable number.

1606401725501 is a deficient number, since it is larger than the sum of its proper divisors (26970751).

1606401725501 is an equidigital number, since it uses as much as digits as its factorization.

1606401725501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26970750.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 1606401725501 in words is "one trillion, six hundred six billion, four hundred one million, seven hundred twenty-five thousand, five hundred one".