864186407819 has 4 divisors (see below), whose sum is σ = 987641608944. Its totient is φ = 740731206696.

The previous prime is 864186407801. The next prime is 864186407857. The reversal of 864186407819 is 918704681468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 864186407819 - 2⁸ = 864186407563 is a prime.

It is a super-2 number, since 2×864186407819² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864186407879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61727600552 + ... + 61727600565.

It is an arithmetic number, because the mean of its divisors is an integer number (246910402236).

Almost surely, 2^864186407819 is an apocalyptic number.

864186407819 is a deficient number, since it is larger than the sum of its proper divisors (123455201125).

864186407819 is a wasteful number, since it uses less digits than its factorization.

864186407819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123455201124.

The product of its (nonzero) digits is 18579456, while the sum is 62.

The spelling of 864186407819 in words is "eight hundred sixty-four billion, one hundred eighty-six million, four hundred seven thousand, eight hundred nineteen".