2639709693 has 6 divisors (see below), whose sum is σ = 3812914014. Its totient is φ = 1759806456.

The previous prime is 2639709661. The next prime is 2639709703. The reversal of 2639709693 is 3969079362.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2081001924 + 558707769 = 45618^2 + 23637^2 .

It is not a de Polignac number, because 2639709693 - 2⁵ = 2639709661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639709593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146650530 + ... + 146650547.

It is an arithmetic number, because the mean of its divisors is an integer number (635485669).

Almost surely, 2^2639709693 is an apocalyptic number.

It is an amenable number.

2639709693 is a deficient number, since it is larger than the sum of its proper divisors (1173204321).

2639709693 is a wasteful number, since it uses less digits than its factorization.

2639709693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293301083 (or 293301080 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 54.

The square root of 2639709693 is about 51378.1051908301. The cubic root of 2639709693 is about 1382.0339839372.

The spelling of 2639709693 in words is "two billion, six hundred thirty-nine million, seven hundred nine thousand, six hundred ninety-three".