25200720450 has 36 divisors (see below), whose sum is σ = 67705936818. Its totient is φ = 6720192000.

The previous prime is 25200720449. The next prime is 25200720463. The reversal of 25200720450 is 5402700252.

25200720450 is a `hidden beast` number, since 2 + 5 + 200 + 7 + 2 + 0 + 450 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 15064862121 + 10135858329 = 122739^2 + 100677^2 .

It is a super-2 number, since 2×25200720450² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28000351 + ... + 28001250.

Almost surely, 2^25200720450 is an apocalyptic number.

25200720450 is an abundant number, since it is smaller than the sum of its proper divisors (42505216368).

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

25200720450 is a wasteful number, since it uses less digits than its factorization.

25200720450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56001619 (or 56001611 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The spelling of 25200720450 in words is "twenty-five billion, two hundred million, seven hundred twenty thousand, four hundred fifty".