77220005391 has 6 divisors (see below), whose sum is σ = 111540007800. Its totient is φ = 51480003588.

The previous prime is 77220005383. The next prime is 77220005393. The reversal of 77220005391 is 19350002277.

It is not a de Polignac number, because 77220005391 - 2³ = 77220005383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77220005393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4290000291 + ... + 4290000308.

It is an arithmetic number, because the mean of its divisors is an integer number (18590001300).

Almost surely, 2^77220005391 is an apocalyptic number.

77220005391 is a deficient number, since it is larger than the sum of its proper divisors (34320002409).

77220005391 is a wasteful number, since it uses less digits than its factorization.

77220005391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8580000605 (or 8580000602 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The spelling of 77220005391 in words is "seventy-seven billion, two hundred twenty million, five thousand, three hundred ninety-one".