85508571784 has 8 divisors (see below), whose sum is σ = 160328572110. Its totient is φ = 42754285888.

The previous prime is 85508571781. The next prime is 85508571853. The reversal of 85508571784 is 48717580558.

It can be written as a sum of positive squares in only one way, i.e., 82386220900 + 3122350884 = 287030^2 + 55878^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (85508571781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5344285729 + ... + 5344285744.

Almost surely, 2^85508571784 is an apocalyptic number.

It is an amenable number.

85508571784 is a deficient number, since it is larger than the sum of its proper divisors (74820000326).

85508571784 is a wasteful number, since it uses less digits than its factorization.

85508571784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688571479 (or 10688571475 counting only the distinct ones).

The product of its (nonzero) digits is 12544000, while the sum is 58.

The spelling of 85508571784 in words is "eighty-five billion, five hundred eight million, five hundred seventy-one thousand, seven hundred eighty-four".