25640262034 has 8 divisors (see below), whose sum is σ = 38506789260. Its totient is φ = 12804665616.

The previous prime is 25640262013. The next prime is 25640262059. The reversal of 25640262034 is 43026204652.

It can be written as a sum of positive squares in 2 ways, for example, as 23791520025 + 1848742009 = 154245^2 + 42997^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7730629 + ... + 7733944.

Almost surely, 2^25640262034 is an apocalyptic number.

25640262034 is a deficient number, since it is larger than the sum of its proper divisors (12866527226).

25640262034 is a wasteful number, since it uses less digits than its factorization.

25640262034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15465404.

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 25640262034 its reverse (43026204652), we get a palindrome (68666466686).

The spelling of 25640262034 in words is "twenty-five billion, six hundred forty million, two hundred sixty-two thousand, thirty-four".