525315661 has 8 divisors (see below), whose sum is σ = 566195000. Its totient is φ = 484503552.

The previous prime is 525315617. The next prime is 525315671. The reversal of 525315661 is 166513525.

It can be written as a sum of positive squares in 4 ways, for example, as 67141636 + 458174025 = 8194^2 + 21405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 525315661 - 2⁷ = 525315533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525315601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61 + ... + 32413.

It is an arithmetic number, because the mean of its divisors is an integer number (70774375).

Almost surely, 2^525315661 is an apocalyptic number.

It is an amenable number.

525315661 is a deficient number, since it is larger than the sum of its proper divisors (40879339).

525315661 is a wasteful number, since it uses less digits than its factorization.

525315661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33615.

The product of its digits is 27000, while the sum is 34.

The square root of 525315661 is about 22919.7657274240. The cubic root of 525315661 is about 806.8759720475.

The spelling of 525315661 in words is "five hundred twenty-five million, three hundred fifteen thousand, six hundred sixty-one".