25061320661 has 32 divisors (see below), whose sum is σ = 28833412608. Its totient is φ = 21577881600.

The previous prime is 25061320523. The next prime is 25061320681. The reversal of 25061320661 is 16602316052.

It is a cyclic number.

It is not a de Polignac number, because 25061320661 - 2³⁰ = 23987578837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25061320681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24260201 + ... + 24261233.

It is an arithmetic number, because the mean of its divisors is an integer number (901044144).

Almost surely, 2^25061320661 is an apocalyptic number.

It is an amenable number.

25061320661 is a deficient number, since it is larger than the sum of its proper divisors (3772091947).

25061320661 is a wasteful number, since it uses less digits than its factorization.

25061320661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 25061320661 in words is "twenty-five billion, sixty-one million, three hundred twenty thousand, six hundred sixty-one".