77220819769 has 8 divisors (see below), whose sum is σ = 77576873472. Its totient is φ = 76864853760.

The previous prime is 77220819763. The next prime is 77220819779. The reversal of 77220819769 is 96791802277.

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

It is a cyclic number.

It is not a de Polignac number, because 77220819769 - 2³ = 77220819761 is a prime.

It is a super-2 number, since 2×77220819769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77220819761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2309964 + ... + 2343154.

It is an arithmetic number, because the mean of its divisors is an integer number (9697109184).

Almost surely, 2^77220819769 is an apocalyptic number.

It is an amenable number.

77220819769 is a deficient number, since it is larger than the sum of its proper divisors (356053703).

77220819769 is a wasteful number, since it uses less digits than its factorization.

77220819769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43847.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The spelling of 77220819769 in words is "seventy-seven billion, two hundred twenty million, eight hundred nineteen thousand, seven hundred sixty-nine".