25571729493 has 6 divisors (see below), whose sum is σ = 36936942614. Its totient is φ = 17047819656.

The previous prime is 25571729461. The next prime is 25571729537. The reversal of 25571729493 is 39492717552.

25571729493 is a `hidden beast` number, since 2 + 5 + 571 + 7 + 29 + 49 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20482761924 + 5088967569 = 143118^2 + 71337^2 .

It is not a de Polignac number, because 25571729493 - 2⁵ = 25571729461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25571729423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1420651630 + ... + 1420651647.

Almost surely, 2^25571729493 is an apocalyptic number.

It is an amenable number.

25571729493 is a deficient number, since it is larger than the sum of its proper divisors (11365213121).

25571729493 is a wasteful number, since it uses less digits than its factorization.

25571729493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841303283 (or 2841303280 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The spelling of 25571729493 in words is "twenty-five billion, five hundred seventy-one million, seven hundred twenty-nine thousand, four hundred ninety-three".