25732956661 has 8 divisors (see below), whose sum is σ = 27527555160. Its totient is φ = 23969568768.

The previous prime is 25732956659. The next prime is 25732956671. The reversal of 25732956661 is 16665923752.

25732956661 = 113430² + 113431².

It can be written as a sum of positive squares in 4 ways, for example, as 2181450436 + 23551506225 = 46706^2 + 153465^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25732956661 - 2¹ = 25732956659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25732956599 and 25732956608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25732956631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7800946 + ... + 7804243.

It is an arithmetic number, because the mean of its divisors is an integer number (3440944395).

Almost surely, 2^25732956661 is an apocalyptic number.

25732956661 is the 113431-st centered square number.

It is an amenable number.

25732956661 is a deficient number, since it is larger than the sum of its proper divisors (1794598499).

25732956661 is a wasteful number, since it uses less digits than its factorization.

25732956661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15605303.

The product of its digits is 4082400, while the sum is 52.

The spelling of 25732956661 in words is "twenty-five billion, seven hundred thirty-two million, nine hundred fifty-six thousand, six hundred sixty-one".