25236106643 has 16 divisors (see below), whose sum is σ = 28556474496. Its totient is φ = 22101387840.

The previous prime is 25236106619. The next prime is 25236106657. The reversal of 25236106643 is 34660163252.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25236106643 - 2¹² = 25236102547 is a prime.

It is a super-2 number, since 2×25236106643² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25236106597 and 25236106606.

It is not an unprimeable number, because it can be changed into a prime (25236106663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330905 + ... + 399962.

It is an arithmetic number, because the mean of its divisors is an integer number (1784779656).

Almost surely, 2^25236106643 is an apocalyptic number.

25236106643 is a deficient number, since it is larger than the sum of its proper divisors (3320367853).

25236106643 is a wasteful number, since it uses less digits than its factorization.

25236106643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730994.

The product of its (nonzero) digits is 155520, while the sum is 38.

Adding to 25236106643 its reverse (34660163252), we get a palindrome (59896269895).

The spelling of 25236106643 in words is "twenty-five billion, two hundred thirty-six million, one hundred six thousand, six hundred forty-three".