25640780198 has 16 divisors (see below), whose sum is σ = 41999760144. Its totient is φ = 11643200160.

The previous prime is 25640780197. The next prime is 25640780201. The reversal of 25640780198 is 89108704652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640780197) 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, 562565 + ... + 606432.

It is an arithmetic number, because the mean of its divisors is an integer number (2624985009).

Almost surely, 2^25640780198 is an apocalyptic number.

25640780198 is a deficient number, since it is larger than the sum of its proper divisors (16358979946).

25640780198 is a wasteful number, since it uses less digits than its factorization.

25640780198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170007.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 25640780198 in words is "twenty-five billion, six hundred forty million, seven hundred eighty thousand, one hundred ninety-eight".