850513729978 has 16 divisors (see below), whose sum is σ = 1409366828160. Its totient is φ = 381703514400.

The previous prime is 850513729969. The next prime is 850513729993. The reversal of 850513729978 is 879927315058.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244680003 + ... + 244683478.

It is an arithmetic number, because the mean of its divisors is an integer number (88085426760).

Almost surely, 2^850513729978 is an apocalyptic number.

850513729978 is a deficient number, since it is larger than the sum of its proper divisors (558853098182).

850513729978 is a wasteful number, since it uses less digits than its factorization.

850513729978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489363573.

The product of its (nonzero) digits is 38102400, while the sum is 64.

The spelling of 850513729978 in words is "eight hundred fifty billion, five hundred thirteen million, seven hundred twenty-nine thousand, nine hundred seventy-eight".