25330641640 has 32 divisors (see below), whose sum is σ = 57032100000. Its totient is φ = 10125473344.

The previous prime is 25330641619. The next prime is 25330641647. The reversal of 25330641640 is 4614603352.

It is a super-4 number, since 4×25330641640⁴ (a number of 43 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25330641596 and 25330641605.

It is not an unprimeable number, because it can be changed into a prime (25330641647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151270 + ... + 271189.

It is an arithmetic number, because the mean of its divisors is an integer number (1782253125).

Almost surely, 2^25330641640 is an apocalyptic number.

25330641640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25330641640 is an abundant number, since it is smaller than the sum of its proper divisors (31701458360).

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

25330641640 is a wasteful number, since it uses less digits than its factorization.

25330641640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423969 (or 423965 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 25330641640 in words is "twenty-five billion, three hundred thirty million, six hundred forty-one thousand, six hundred forty".