77192217809 has 16 divisors (see below), whose sum is σ = 94543304448. Its totient is φ = 61577537472.

The previous prime is 77192217803. The next prime is 77192217841. The reversal of 77192217809 is 90871229177.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 77192217809 - 2²⁴ = 77175440593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77192217803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6473162 + ... + 6485075.

It is an arithmetic number, because the mean of its divisors is an integer number (5908956528).

Almost surely, 2^77192217809 is an apocalyptic number.

It is an amenable number.

77192217809 is a deficient number, since it is larger than the sum of its proper divisors (17351086639).

77192217809 is a wasteful number, since it uses less digits than its factorization.

77192217809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12958304.

The product of its (nonzero) digits is 889056, while the sum is 53.

The spelling of 77192217809 in words is "seventy-seven billion, one hundred ninety-two million, two hundred seventeen thousand, eight hundred nine".