2525350661 has 4 divisors (see below), whose sum is σ = 2530975500. Its totient is φ = 2519725824.

The previous prime is 2525350657. The next prime is 2525350673. The reversal of 2525350661 is 1660535252.

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 1780333636 + 745017025 = 42194^2 + 27295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2525350661 - 2² = 2525350657 is a prime.

It is a super-2 number, since 2×2525350661² = 12754791922026273842, which contains 22 as substring.

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 (2525350631) 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, 2811746 + ... + 2812643.

It is an arithmetic number, because the mean of its divisors is an integer number (632743875).

Almost surely, 2^2525350661 is an apocalyptic number.

It is an amenable number.

2525350661 is a deficient number, since it is larger than the sum of its proper divisors (5624839).

2525350661 is an equidigital number, since it uses as much as digits as its factorization.

2525350661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624838.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 2525350661 is about 50252.8671918329. The cubic root of 2525350661 is about 1361.7808743471.

The spelling of 2525350661 in words is "two billion, five hundred twenty-five million, three hundred fifty thousand, six hundred sixty-one".