85921784674 has 12 divisors (see below), whose sum is σ = 141664430502. Its totient is φ = 39055356560.

The previous prime is 85921784647. The next prime is 85921784681. The reversal of 85921784674 is 47648712958.

It can be written as a sum of positive squares in only one way, i.e., 64081378449 + 21840406225 = 253143^2 + 147785^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177524107 + ... + 177524590.

Almost surely, 2^85921784674 is an apocalyptic number.

85921784674 is a deficient number, since it is larger than the sum of its proper divisors (55742645828).

85921784674 is a wasteful number, since it uses less digits than its factorization.

85921784674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355048721 (or 355048710 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 85921784674 in words is "eighty-five billion, nine hundred twenty-one million, seven hundred eighty-four thousand, six hundred seventy-four".