25642782145 has 4 divisors (see below), whose sum is σ = 30771338580. Its totient is φ = 20514225712.

The previous prime is 25642782131. The next prime is 25642782149. The reversal of 25642782145 is 54128724652.

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 4331745856 + 21311036289 = 65816^2 + 145983^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642782145 - 2¹⁹ = 25642257857 is a prime.

It is a super-2 number, since 2×25642782145² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25642782095 and 25642782104.

It is not an unprimeable number, because it can be changed into a prime (25642782149) 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, 2564278210 + ... + 2564278219.

It is an arithmetic number, because the mean of its divisors is an integer number (7692834645).

Almost surely, 2^25642782145 is an apocalyptic number.

It is an amenable number.

25642782145 is a deficient number, since it is larger than the sum of its proper divisors (5128556435).

25642782145 is an equidigital number, since it uses as much as digits as its factorization.

25642782145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128556434.

The product of its digits is 1075200, while the sum is 46.

The spelling of 25642782145 in words is "twenty-five billion, six hundred forty-two million, seven hundred eighty-two thousand, one hundred forty-five".