25711641720 has 48 divisors (see below), whose sum is σ = 83562836760. Its totient is φ = 6856437696.

The previous prime is 25711641691. The next prime is 25711641727. The reversal of 25711641720 is 2714611752.

25711641720 is a `hidden beast` number, since 2 + 5 + 7 + 1 + 1 + 641 + 7 + 2 + 0 = 666.

It is a super-2 number, since 2×25711641720² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25711641727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35710254 + ... + 35710973.

Almost surely, 2^25711641720 is an apocalyptic number.

25711641720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25711641720 is an abundant number, since it is smaller than the sum of its proper divisors (57851195040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25711641720 is a wasteful number, since it uses less digits than its factorization.

25711641720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71421244 (or 71421237 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 25711641720 in words is "twenty-five billion, seven hundred eleven million, six hundred forty-one thousand, seven hundred twenty".