866513788171755 has 16 divisors (see below), whose sum is σ = 1459391643237120. Its totient is φ = 437817492970848.

The previous prime is 866513788171739. The next prime is 866513788171763. The reversal of 866513788171755 is 557171887315668.

It is not a de Polignac number, because 866513788171755 - 2⁴ = 866513788171739 is a prime.

It is a super-2 number, since 2×866513788171755² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1520199628087 + ... + 1520199628656.

It is an arithmetic number, because the mean of its divisors is an integer number (91211977702320).

Almost surely, 2^{866513788171755} is an apocalyptic number.

866513788171755 is a deficient number, since it is larger than the sum of its proper divisors (592877855065365).

866513788171755 is a wasteful number, since it uses less digits than its factorization.

866513788171755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040399256770.

The product of its digits is 2370816000, while the sum is 78.

The spelling of 866513788171755 in words is "eight hundred sixty-six trillion, five hundred thirteen billion, seven hundred eighty-eight million, one hundred seventy-one thousand, seven hundred fifty-five".