25999258620 has 24 divisors (see below), whose sum is σ = 72797924304. Its totient is φ = 6933135616.

The previous prime is 25999258609. The next prime is 25999258631. The reversal of 25999258620 is 2685299952.

It is an interprime number because it is at equal distance from previous prime (25999258609) and next prime (25999258631).

It is a super-2 number, since 2×25999258620² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216660429 + ... + 216660548.

It is an arithmetic number, because the mean of its divisors is an integer number (3033246846).

Almost surely, 2^25999258620 is an apocalyptic number.

25999258620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25999258620 is an abundant number, since it is smaller than the sum of its proper divisors (46798665684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25999258620 is a wasteful number, since it uses less digits than its factorization.

25999258620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433320989 (or 433320987 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 57.

The spelling of 25999258620 in words is "twenty-five billion, nine hundred ninety-nine million, two hundred fifty-eight thousand, six hundred twenty".