77066643 has 16 divisors (see below), whose sum is σ = 104146560. Its totient is φ = 50686656.

The previous prime is 77066573. The next prime is 77066653. The reversal of 77066643 is 34666077.

It is not a de Polignac number, because 77066643 - 2⁸ = 77066387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77066653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130996 + ... + 131582.

It is an arithmetic number, because the mean of its divisors is an integer number (6509160).

Almost surely, 2^77066643 is an apocalyptic number.

77066643 is a deficient number, since it is larger than the sum of its proper divisors (27079917).

77066643 is a wasteful number, since it uses less digits than its factorization.

77066643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 127008, while the sum is 39.

The square root of 77066643 is about 8778.7609034533. The cubic root of 77066643 is about 425.5547873555.

The spelling of 77066643 in words is "seventy-seven million, sixty-six thousand, six hundred forty-three".