25715720161 has 8 divisors (see below), whose sum is σ = 25845783264. Its totient is φ = 25585734720.

The previous prime is 25715720143. The next prime is 25715720179. The reversal of 25715720161 is 16102751752.

It is an interprime number because it is at equal distance from previous prime (25715720143) and next prime (25715720179).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25715720161 - 2¹³ = 25715711969 is a prime.

It is a super-2 number, since 2×25715720161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25715720161.

It is not an unprimeable number, because it can be changed into a prime (25715700161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713961 + ... + 749113.

It is an arithmetic number, because the mean of its divisors is an integer number (3230722908).

Almost surely, 2^25715720161 is an apocalyptic number.

It is an amenable number.

25715720161 is a deficient number, since it is larger than the sum of its proper divisors (130063103).

25715720161 is a wasteful number, since it uses less digits than its factorization.

25715720161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38831.

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 25715720161 in words is "twenty-five billion, seven hundred fifteen million, seven hundred twenty thousand, one hundred sixty-one".