77221566512277 has 8 divisors (see below), whose sum is σ = 112322278563360. Its totient is φ = 46800949401360.

The previous prime is 77221566512273. The next prime is 77221566512281.

77221566512277 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (77221566512273) and next prime (77221566512281).

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

It is not a de Polignac number, because 77221566512277 - 2² = 77221566512273 is a prime.

It is a super-2 number, since 2×77221566512277² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77221566512277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77221566512273) 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, 1170023735002 + ... + 1170023735067.

It is an arithmetic number, because the mean of its divisors is an integer number (14040284820420).

Almost surely, 2^{77221566512277} is an apocalyptic number.

It is an amenable number.

77221566512277 is a deficient number, since it is larger than the sum of its proper divisors (35100712051083).

77221566512277 is a wasteful number, since it uses less digits than its factorization.

77221566512277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340047470083.

The product of its digits is 34574400, while the sum is 60.

The spelling of 77221566512277 in words is "seventy-seven trillion, two hundred twenty-one billion, five hundred sixty-six million, five hundred twelve thousand, two hundred seventy-seven".