7640394566 has 8 divisors (see below), whose sum is σ = 13097819280. Its totient is φ = 3274454808.

The previous prime is 7640394563. The next prime is 7640394673. The reversal of 7640394566 is 6654930467.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640394563) 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, 272871221 + ... + 272871248.

It is an arithmetic number, because the mean of its divisors is an integer number (1637227410).

Almost surely, 2^7640394566 is an apocalyptic number.

7640394566 is a deficient number, since it is larger than the sum of its proper divisors (5457424714).

7640394566 is a wasteful number, since it uses less digits than its factorization.

7640394566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545742478.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The square root of 7640394566 is about 87409.3505638842. The cubic root of 7640394566 is about 1969.5723058232.

The spelling of 7640394566 in words is "seven billion, six hundred forty million, three hundred ninety-four thousand, five hundred sixty-six".