25430643101 has 4 divisors (see below), whose sum is σ = 25577641212. Its totient is φ = 25283644992.

The previous prime is 25430643071. The next prime is 25430643167. The reversal of 25430643101 is 10134603452.

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 24790502500 + 640140601 = 157450^2 + 25301^2 .

It is a cyclic number.

It is not a de Polignac number, because 25430643101 - 2¹⁴ = 25430626717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25430943101) 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, 73498796 + ... + 73499141.

It is an arithmetic number, because the mean of its divisors is an integer number (6394410303).

Almost surely, 2^25430643101 is an apocalyptic number.

It is an amenable number.

25430643101 is a deficient number, since it is larger than the sum of its proper divisors (146998111).

25430643101 is a wasteful number, since it uses less digits than its factorization.

25430643101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146998110.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 25430643101 in words is "twenty-five billion, four hundred thirty million, six hundred forty-three thousand, one hundred one".