25947393865 has 16 divisors (see below), whose sum is σ = 32188962960. Its totient is φ = 20065812480.

The previous prime is 25947393853. The next prime is 25947393877. The reversal of 25947393865 is 56839374952.

It is an interprime number because it is at equal distance from previous prime (25947393853) and next prime (25947393877).

It can be written as a sum of positive squares in 8 ways, for example, as 1506448969 + 24440944896 = 38813^2 + 156336^2 .

It is not a de Polignac number, because 25947393865 - 2¹¹ = 25947391817 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 558264 + ... + 602953.

It is an arithmetic number, because the mean of its divisors is an integer number (2011810185).

Almost surely, 2^25947393865 is an apocalyptic number.

It is an amenable number.

25947393865 is a deficient number, since it is larger than the sum of its proper divisors (6241569095).

25947393865 is a wasteful number, since it uses less digits than its factorization.

25947393865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161372.

The product of its digits is 48988800, while the sum is 61.

The spelling of 25947393865 in words is "twenty-five billion, nine hundred forty-seven million, three hundred ninety-three thousand, eight hundred sixty-five".