6400981025 has 12 divisors (see below), whose sum is σ = 7938480000. Its totient is φ = 5119969680.

The previous prime is 6400981009. The next prime is 6400981043. The reversal of 6400981025 is 5201890046.

It is not a de Polignac number, because 6400981025 - 2⁴ = 6400981009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177476 + ... + 210474.

It is an arithmetic number, because the mean of its divisors is an integer number (661540000).

Almost surely, 2^6400981025 is an apocalyptic number.

It is an amenable number.

6400981025 is a deficient number, since it is larger than the sum of its proper divisors (1537498975).

6400981025 is a wasteful number, since it uses less digits than its factorization.

6400981025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40768 (or 40763 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 6400981025 is about 80006.1311713046. The cubic root of 6400981025 is about 1856.7303934877.

The spelling of 6400981025 in words is "six billion, four hundred million, nine hundred eighty-one thousand, twenty-five".