2025561555 has 12 divisors (see below), whose sum is σ = 3510973440. Its totient is φ = 1080299472.

The previous prime is 2025561553. The next prime is 2025561583. The reversal of 2025561555 is 5551655202.

2025561555 is a `hidden beast` number, since 20 + 25 + 5 + 61 + 555 = 666.

It is not a de Polignac number, because 2025561555 - 2¹ = 2025561553 is a prime.

It is a super-2 number, since 2×2025561555² = 8205799226188036050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2025561553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22506195 + ... + 22506284.

It is an arithmetic number, because the mean of its divisors is an integer number (292581120).

Almost surely, 2^2025561555 is an apocalyptic number.

2025561555 is a deficient number, since it is larger than the sum of its proper divisors (1485411885).

2025561555 is a wasteful number, since it uses less digits than its factorization.

2025561555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45012490 (or 45012487 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The square root of 2025561555 is about 45006.2390674893. The cubic root of 2025561555 is about 1265.2659337689.

It can be divided in two parts, 20255 and 61555, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 2025561555 in words is "two billion, twenty-five million, five hundred sixty-one thousand, five hundred fifty-five".