25555726987 has 16 divisors (see below), whose sum is σ = 29652486912. Its totient is φ = 21570674400.

The previous prime is 25555726957. The next prime is 25555727011. The reversal of 25555726987 is 78962755552.

It is a cyclic number.

It is not a de Polignac number, because 25555726987 - 2²³ = 25547338379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25555726957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1728408 + ... + 1743130.

It is an arithmetic number, because the mean of its divisors is an integer number (1853280432).

Almost surely, 2^25555726987 is an apocalyptic number.

25555726987 is a deficient number, since it is larger than the sum of its proper divisors (4096759925).

25555726987 is a wasteful number, since it uses less digits than its factorization.

25555726987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18498.

The product of its digits is 52920000, while the sum is 61.

The spelling of 25555726987 in words is "twenty-five billion, five hundred fifty-five million, seven hundred twenty-six thousand, nine hundred eighty-seven".