25551015550 has 24 divisors (see below), whose sum is σ = 47539542096. Its totient is φ = 10217255040.

The previous prime is 25551015499. The next prime is 25551015557. The reversal of 25551015550 is 5551015552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25551015557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88527 + ... + 242773.

It is an arithmetic number, because the mean of its divisors is an integer number (1980814254).

Almost surely, 2^25551015550 is an apocalyptic number.

25551015550 is a deficient number, since it is larger than the sum of its proper divisors (21988526546).

25551015550 is a wasteful number, since it uses less digits than its factorization.

25551015550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157572 (or 157567 counting only the distinct ones).

The product of its (nonzero) digits is 31250, while the sum is 34.

The spelling of 25551015550 in words is "twenty-five billion, five hundred fifty-one million, fifteen thousand, five hundred fifty".