77829040066 has 4 divisors (see below), whose sum is σ = 116743560102. Its totient is φ = 38914520032.

The previous prime is 77829040063. The next prime is 77829040097. The reversal of 77829040066 is 66004092877.

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

It can be written as a sum of positive squares in only one way, i.e., 56081344225 + 21747695841 = 236815^2 + 147471^2 .

It is not an unprimeable number, because it can be changed into a prime (77829040063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19457260015 + ... + 19457260018.

Almost surely, 2^77829040066 is an apocalyptic number.

77829040066 is a deficient number, since it is larger than the sum of its proper divisors (38914520036).

77829040066 is a wasteful number, since it uses less digits than its factorization.

77829040066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38914520035.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 77829040066 in words is "seventy-seven billion, eight hundred twenty-nine million, forty thousand, sixty-six".