1216765677 has 8 divisors (see below), whose sum is σ = 1638105664. Its totient is φ = 803301408.

The previous prime is 1216765639. The next prime is 1216765709. The reversal of 1216765677 is 7765676121.

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

It is not a de Polignac number, because 1216765677 - 2⁷ = 1216765549 is a prime.

It is a super-3 number, since 3×1216765677³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216765577) 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, 1968568 + ... + 1969185.

It is an arithmetic number, because the mean of its divisors is an integer number (204763208).

Almost surely, 2^1216765677 is an apocalyptic number.

It is an amenable number.

1216765677 is a deficient number, since it is larger than the sum of its proper divisors (421339987).

1216765677 is a wasteful number, since it uses less digits than its factorization.

1216765677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937859.

The product of its digits is 740880, while the sum is 48.

The square root of 1216765677 is about 34882.1684675709. The cubic root of 1216765677 is about 1067.5846403097.

The spelling of 1216765677 in words is "one billion, two hundred sixteen million, seven hundred sixty-five thousand, six hundred seventy-seven".