25647045121 has 4 divisors (see below), whose sum is σ = 27155694852. Its totient is φ = 24138395392.

The previous prime is 25647045107. The next prime is 25647045157. The reversal of 25647045121 is 12154074652.

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 22820634225 + 2826410896 = 151065^2 + 53164^2 .

It is a cyclic number.

It is not a de Polignac number, because 25647045121 - 2⁷ = 25647044993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25647045161) 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, 754324840 + ... + 754324873.

It is an arithmetic number, because the mean of its divisors is an integer number (6788923713).

Almost surely, 2^25647045121 is an apocalyptic number.

It is an amenable number.

25647045121 is a deficient number, since it is larger than the sum of its proper divisors (1508649731).

25647045121 is a wasteful number, since it uses less digits than its factorization.

25647045121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508649730.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 25647045121 in words is "twenty-five billion, six hundred forty-seven million, forty-five thousand, one hundred twenty-one".