806865955439978 has 32 divisors (see below), whose sum is σ = 1399975813748736. Its totient is φ = 341606103532848.

The previous prime is 806865955439933. The next prime is 806865955440001. The reversal of 806865955439978 is 879934559568608.

It is a happy number.

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, 13239926 + ... + 42296897.

It is an arithmetic number, because the mean of its divisors is an integer number (43749244179648).

Almost surely, 2^{806865955439978} is an apocalyptic number.

806865955439978 is a deficient number, since it is larger than the sum of its proper divisors (593109858308758).

806865955439978 is a wasteful number, since it uses less digits than its factorization.

806865955439978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55549418.

The product of its (nonzero) digits is 141087744000, while the sum is 92.

The spelling of 806865955439978 in words is "eight hundred six trillion, eight hundred sixty-five billion, nine hundred fifty-five million, four hundred thirty-nine thousand, nine hundred seventy-eight".