25400442536 has 32 divisors (see below), whose sum is σ = 54439015680. Its totient is φ = 10884004800.

The previous prime is 25400442499. The next prime is 25400442563. The reversal of 25400442536 is 63524400452.

It is a super-2 number, since 2×25400442536² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25400442496 and 25400442505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311921 + ... + 384831.

It is an arithmetic number, because the mean of its divisors is an integer number (1701219240).

Almost surely, 2^25400442536 is an apocalyptic number.

It is an amenable number.

25400442536 is an abundant number, since it is smaller than the sum of its proper divisors (29038573144).

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

25400442536 is a wasteful number, since it uses less digits than its factorization.

25400442536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79145 (or 79141 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 25400442536 its reverse (63524400452), we get a palindrome (88924842988).

The spelling of 25400442536 in words is "twenty-five billion, four hundred million, four hundred forty-two thousand, five hundred thirty-six".