25712122501 has 4 divisors (see below), whose sum is σ = 27689978092. Its totient is φ = 23734266912.

The previous prime is 25712122489. The next prime is 25712122523. The reversal of 25712122501 is 10522121752.

It is a Cunningham number, because it is equal to 160350²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3803682276 + 21908440225 = 61674^2 + 148015^2 .

It is a cyclic number.

It is not a de Polignac number, because 25712122501 - 2¹¹ = 25712120453 is a prime.

It is a super-2 number, since 2×25712122501² (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 25712122501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25712122531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988927776 + ... + 988927801.

It is an arithmetic number, because the mean of its divisors is an integer number (6922494523).

Almost surely, 2^25712122501 is an apocalyptic number.

It is an amenable number.

25712122501 is a deficient number, since it is larger than the sum of its proper divisors (1977855591).

25712122501 is a wasteful number, since it uses less digits than its factorization.

25712122501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977855590.

The product of its (nonzero) digits is 2800, while the sum is 28.

The spelling of 25712122501 in words is "twenty-five billion, seven hundred twelve million, one hundred twenty-two thousand, five hundred one".