85866547007621 has 16 divisors (see below), whose sum is σ = 87798209083200. Its totient is φ = 83951084114688.

The previous prime is 85866547007617. The next prime is 85866547007627. The reversal of 85866547007621 is 12670074566858.

It is a cyclic number.

It is not a de Polignac number, because 85866547007621 - 2² = 85866547007617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85866547007627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29516381 + ... + 32294733.

It is an arithmetic number, because the mean of its divisors is an integer number (5487388067700).

Almost surely, 2^{85866547007621} is an apocalyptic number.

It is an amenable number.

85866547007621 is a deficient number, since it is larger than the sum of its proper divisors (1931662075579).

85866547007621 is a wasteful number, since it uses less digits than its factorization.

85866547007621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781268.

The product of its (nonzero) digits is 135475200, while the sum is 65.

The spelling of 85866547007621 in words is "eighty-five trillion, eight hundred sixty-six billion, five hundred forty-seven million, seven thousand, six hundred twenty-one".