525701261721605 has 4 divisors (see below), whose sum is σ = 630841514065932. Its totient is φ = 420561009377280.

The previous prime is 525701261721599. The next prime is 525701261721607. The reversal of 525701261721605 is 506127162107525.

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 63305351209156 + 462395910512449 = 7956466^2 + 21503393^2 .

It is not a de Polignac number, because 525701261721605 - 2²⁸ = 525700993286149 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 (525701261721607) 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, 52570126172156 + ... + 52570126172165.

It is an arithmetic number, because the mean of its divisors is an integer number (157710378516483).

Almost surely, 2^{525701261721605} is an apocalyptic number.

It is an amenable number.

525701261721605 is a deficient number, since it is larger than the sum of its proper divisors (105140252344327).

525701261721605 is a wasteful number, since it uses less digits than its factorization.

525701261721605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105140252344326.

The product of its (nonzero) digits is 1764000, while the sum is 50.

The spelling of 525701261721605 in words is "five hundred twenty-five trillion, seven hundred one billion, two hundred sixty-one million, seven hundred twenty-one thousand, six hundred five".