5261640639 has 4 divisors (see below), whose sum is σ = 7015520856. Its totient is φ = 3507760424.

The previous prime is 5261640619. The next prime is 5261640653. The reversal of 5261640639 is 9360461625.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5261640639 - 2⁸ = 5261640383 is a prime.

It is a super-3 number, since 3×5261640639³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5261640639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5261640619) 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, 876940104 + ... + 876940109.

It is an arithmetic number, because the mean of its divisors is an integer number (1753880214).

Almost surely, 2^5261640639 is an apocalyptic number.

5261640639 is a deficient number, since it is larger than the sum of its proper divisors (1753880217).

5261640639 is a wasteful number, since it uses less digits than its factorization.

5261640639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753880216.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 5261640639 is about 72537.1672937398. The cubic root of 5261640639 is about 1739.2969193404.

The spelling of 5261640639 in words is "five billion, two hundred sixty-one million, six hundred forty thousand, six hundred thirty-nine".