25279985493 has 64 divisors (see below), whose sum is σ = 44266291200. Its totient is φ = 13953306240.

The previous prime is 25279985491. The next prime is 25279985501. The reversal of 25279985493 is 39458997252.

25279985493 is a `hidden beast` number, since 2 + 52 + 7 + 9 + 98 + 5 + 493 = 666.

It is not a de Polignac number, because 25279985493 - 2¹ = 25279985491 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 25279985493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25279985491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3329980 + ... + 3337562.

It is an arithmetic number, because the mean of its divisors is an integer number (691660800).

Almost surely, 2^25279985493 is an apocalyptic number.

It is an amenable number.

25279985493 is a deficient number, since it is larger than the sum of its proper divisors (18986305707).

25279985493 is a wasteful number, since it uses less digits than its factorization.

25279985493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8199 (or 8193 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 25279985493 in words is "twenty-five billion, two hundred seventy-nine million, nine hundred eighty-five thousand, four hundred ninety-three".