7657135221 has 4 divisors (see below), whose sum is σ = 10209513632. Its totient is φ = 5104756812.

The previous prime is 7657135219. The next prime is 7657135231. The reversal of 7657135221 is 1225317567.

It is a happy number.

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 not a de Polignac number, because 7657135221 - 2¹ = 7657135219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7657135221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7657135231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276189201 + ... + 1276189206.

It is an arithmetic number, because the mean of its divisors is an integer number (2552378408).

Almost surely, 2^7657135221 is an apocalyptic number.

It is an amenable number.

7657135221 is a deficient number, since it is larger than the sum of its proper divisors (2552378411).

7657135221 is a wasteful number, since it uses less digits than its factorization.

7657135221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552378410.

The product of its digits is 88200, while the sum is 39.

The square root of 7657135221 is about 87505.0582595086. The cubic root of 7657135221 is about 1971.0097480985.

The spelling of 7657135221 in words is "seven billion, six hundred fifty-seven million, one hundred thirty-five thousand, two hundred twenty-one".