25550555555 has 16 divisors (see below), whose sum is σ = 35045187840. Its totient is φ = 17518168032.

The previous prime is 25550555549. The next prime is 25550555557. The reversal of 25550555555 is 55555505552.

It is a cyclic number.

It is not a de Polignac number, because 25550555555 - 2¹⁸ = 25550293411 is a prime.

25550555555 is a modest number, since divided by 555555 gives 25550 as remainder.

It is not an unprimeable number, because it can be changed into a prime (25550555557) 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, 264416 + ... + 347874.

It is an arithmetic number, because the mean of its divisors is an integer number (2190324240).

Almost surely, 2^25550555555 is an apocalyptic number.

25550555555 is a deficient number, since it is larger than the sum of its proper divisors (9494632285).

25550555555 is an equidigital number, since it uses as much as digits as its factorization.

25550555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92218.

The product of its (nonzero) digits is 3906250, while the sum is 47.

The spelling of 25550555555 in words is "twenty-five billion, five hundred fifty million, five hundred fifty-five thousand, five hundred fifty-five".