866786274780416 has 36 divisors (see below), whose sum is σ = 1730308542808692. Its totient is φ = 433362608480256.

The previous prime is 866786274780313. The next prime is 866786274780509. The reversal of 866786274780416 is 614087472687668.

It can be written as a sum of positive squares in 2 ways, for example, as 571424929014016 + 295361345766400 = 23904496^2 + 17186080^2 .

It is a super-2 number, since 2×866786274780416² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115612025 + ... + 122880888.

Almost surely, 2^{866786274780416} is an apocalyptic number.

It is an amenable number.

866786274780416 is a deficient number, since it is larger than the sum of its proper divisors (863522268028276).

866786274780416 is a wasteful number, since it uses less digits than its factorization.

866786274780416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238507126 (or 238507112 counting only the distinct ones).

The product of its (nonzero) digits is 7283146752, while the sum is 80.

The spelling of 866786274780416 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-four million, seven hundred eighty thousand, four hundred sixteen".