25996929840 has 480 divisors, whose sum is σ = 103592226816. Its totient is φ = 5717329920.

The previous prime is 25996929823. The next prime is 25996929857. The reversal of 25996929840 is 4892969952.

25996929840 is a `hidden beast` number, since 259 + 96 + 9 + 298 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (25996929823) and next prime (25996929857).

It is a super-2 number, since 2×25996929840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 35466114 + ... + 35466846.

Almost surely, 2^25996929840 is an apocalyptic number.

25996929840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25996929840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51796113408).

25996929840 is an abundant number, since it is smaller than the sum of its proper divisors (77595296976).

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

25996929840 is a wasteful number, since it uses less digits than its factorization.

25996929840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 25996929840 in words is "twenty-five billion, nine hundred ninety-six million, nine hundred twenty-nine thousand, eight hundred forty".