85509136588778 has 16 divisors (see below), whose sum is σ = 146590190933760. Its totient is φ = 36645997914096.

The previous prime is 85509136588747. The next prime is 85509136588801. The reversal of 85509136588778 is 87788563190558.

It is a happy number.

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, 63889826 + ... + 65214477.

It is an arithmetic number, because the mean of its divisors is an integer number (9161886933360).

Almost surely, 2^{85509136588778} is an apocalyptic number.

85509136588778 is a deficient number, since it is larger than the sum of its proper divisors (61081054344982).

85509136588778 is a wasteful number, since it uses less digits than its factorization.

85509136588778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129151621.

The product of its (nonzero) digits is 4064256000, while the sum is 80.

The spelling of 85509136588778 in words is "eighty-five trillion, five hundred nine billion, one hundred thirty-six million, five hundred eighty-eight thousand, seven hundred seventy-eight".