25820533957 has 8 divisors (see below), whose sum is σ = 26030564352. Its totient is φ = 25610608800.

The previous prime is 25820533939. The next prime is 25820533967. The reversal of 25820533957 is 75933502852.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25820533957 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 25820533957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820533967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510657 + ... + 558937.

It is an arithmetic number, because the mean of its divisors is an integer number (3253820544).

Almost surely, 2^25820533957 is an apocalyptic number.

It is an amenable number.

25820533957 is a deficient number, since it is larger than the sum of its proper divisors (210030395).

25820533957 is a wasteful number, since it uses less digits than its factorization.

25820533957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52619.

The product of its (nonzero) digits is 2268000, while the sum is 49.

The spelling of 25820533957 in words is "twenty-five billion, eight hundred twenty million, five hundred thirty-three thousand, nine hundred fifty-seven".