25001263649 has 4 divisors (see below), whose sum is σ = 26088275136. Its totient is φ = 23914252164.

The previous prime is 25001263627. The next prime is 25001263667. The reversal of 25001263649 is 94636210052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25001263649 - 2¹⁶ = 25001198113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25001263669) 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, 543505709 + ... + 543505754.

It is an arithmetic number, because the mean of its divisors is an integer number (6522068784).

Almost surely, 2^25001263649 is an apocalyptic number.

It is an amenable number.

25001263649 is a deficient number, since it is larger than the sum of its proper divisors (1087011487).

25001263649 is a wasteful number, since it uses less digits than its factorization.

25001263649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087011486.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 25001263649 in words is "twenty-five billion, one million, two hundred sixty-three thousand, six hundred forty-nine".