25000400052 has 18 divisors (see below), whose sum is σ = 63195455778. Its totient is φ = 8333466672.

The previous prime is 25000400021. The next prime is 25000400057.

25000400052 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 21867311376 + 3133088676 = 147876^2 + 55974^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25000399998 and 25000400034.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25000400057) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 347227743 + ... + 347227814.

Almost surely, 2^25000400052 is an apocalyptic number.

It is an amenable number.

25000400052 is an abundant number, since it is smaller than the sum of its proper divisors (38195055726).

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

25000400052 is a wasteful number, since it uses less digits than its factorization.

25000400052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694455567 (or 694455562 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The spelling of 25000400052 in words is "twenty-five billion, four hundred thousand, fifty-two".