77640072833 has 4 divisors (see below), whose sum is σ = 79533733188. Its totient is φ = 75746412480.

The previous prime is 77640072803. The next prime is 77640072857. The reversal of 77640072833 is 33827004677.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27492292864 + 50147779969 = 165808^2 + 223937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77640072833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77640072803) 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, 946830116 + ... + 946830197.

It is an arithmetic number, because the mean of its divisors is an integer number (19883433297).

Almost surely, 2^77640072833 is an apocalyptic number.

It is an amenable number.

77640072833 is a deficient number, since it is larger than the sum of its proper divisors (1893660355).

77640072833 is a wasteful number, since it uses less digits than its factorization.

77640072833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893660354.

The product of its (nonzero) digits is 1185408, while the sum is 47.

The spelling of 77640072833 in words is "seventy-seven billion, six hundred forty million, seventy-two thousand, eight hundred thirty-three".