25345642691 has 8 divisors (see below), whose sum is σ = 26242444800. Its totient is φ = 24450361600.

The previous prime is 25345642681. The next prime is 25345642739. The reversal of 25345642691 is 19624654352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25345642691 - 2⁶ = 25345642627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25345642681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346286 + ... + 413043.

It is an arithmetic number, because the mean of its divisors is an integer number (3280305600).

Almost surely, 2^25345642691 is an apocalyptic number.

25345642691 is a deficient number, since it is larger than the sum of its proper divisors (896802109).

25345642691 is a wasteful number, since it uses less digits than its factorization.

25345642691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760509.

The product of its digits is 1555200, while the sum is 47.

The spelling of 25345642691 in words is "twenty-five billion, three hundred forty-five million, six hundred forty-two thousand, six hundred ninety-one".