866537252866751 has 8 divisors (see below), whose sum is σ = 904213729645440. Its totient is φ = 828860854758552.

The previous prime is 866537252866721. The next prime is 866537252866787. The reversal of 866537252866751 is 157668252735668.

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

It is a cyclic number.

It is not a de Polignac number, because 866537252866751 - 2¹⁸ = 866537252604607 is a prime.

It is a super-2 number, since 2×866537252866751² (a number of 31 digits) contains 22 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 (866537252866721) 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, 3417356 + ... + 41770238.

It is an arithmetic number, because the mean of its divisors is an integer number (113026716205680).

Almost surely, 2^{866537252866751} is an apocalyptic number.

866537252866751 is a deficient number, since it is larger than the sum of its proper divisors (37676476778689).

866537252866751 is a wasteful number, since it uses less digits than its factorization.

866537252866751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39335245.

The product of its digits is 6096384000, while the sum is 77.

The spelling of 866537252866751 in words is "eight hundred sixty-six trillion, five hundred thirty-seven billion, two hundred fifty-two million, eight hundred sixty-six thousand, seven hundred fifty-one".