25435555550 has 48 divisors (see below), whose sum is σ = 52729593840. Its totient is φ = 9071746560.

The previous prime is 25435555547. The next prime is 25435555559. The reversal of 25435555550 is 5555553452.

It is a super-2 number, since 2×25435555550² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25435555559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 771329 + ... + 803628.

It is an arithmetic number, because the mean of its divisors is an integer number (1098533205).

Almost surely, 2^25435555550 is an apocalyptic number.

25435555550 is an abundant number, since it is smaller than the sum of its proper divisors (27294038290).

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

25435555550 is a wasteful number, since it uses less digits than its factorization.

25435555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575005 (or 1575000 counting only the distinct ones).

The product of its (nonzero) digits is 1875000, while the sum is 44.

The spelling of 25435555550 in words is "twenty-five billion, four hundred thirty-five million, five hundred fifty-five thousand, five hundred fifty".