7525561657 has 4 divisors (see below), whose sum is σ = 7584818176. Its totient is φ = 7466305140.

The previous prime is 7525561639. The next prime is 7525561663. The reversal of 7525561657 is 7561655257.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7525561657 - 2⁷ = 7525561529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7525561657.

It is not an unprimeable number, because it can be changed into a prime (7525561607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29628069 + ... + 29628322.

It is an arithmetic number, because the mean of its divisors is an integer number (1896204544).

Almost surely, 2^7525561657 is an apocalyptic number.

It is an amenable number.

7525561657 is a deficient number, since it is larger than the sum of its proper divisors (59256519).

7525561657 is a wasteful number, since it uses less digits than its factorization.

7525561657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59256518.

The product of its digits is 2205000, while the sum is 49.

The square root of 7525561657 is about 86749.9951412102. The cubic root of 7525561657 is about 1959.6550879435.

The spelling of 7525561657 in words is "seven billion, five hundred twenty-five million, five hundred sixty-one thousand, six hundred fifty-seven".