25720749993 has 16 divisors (see below), whose sum is σ = 35029532736. Its totient is φ = 16783153920.

The previous prime is 25720749983. The next prime is 25720750001. The reversal of 25720749993 is 39994702752.

It is not a de Polignac number, because 25720749993 - 2⁸ = 25720749737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25720749983) 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 15 ways as a sum of consecutive naturals, for example, 419580 + ... + 476957.

It is an arithmetic number, because the mean of its divisors is an integer number (2189345796).

Almost surely, 2^25720749993 is an apocalyptic number.

It is an amenable number.

25720749993 is a deficient number, since it is larger than the sum of its proper divisors (9308782743).

25720749993 is a wasteful number, since it uses less digits than its factorization.

25720749993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896744.

The product of its (nonzero) digits is 8573040, while the sum is 57.

The spelling of 25720749993 in words is "twenty-five billion, seven hundred twenty million, seven hundred forty-nine thousand, nine hundred ninety-three".