85549547878 has 4 divisors (see below), whose sum is σ = 128324321820. Its totient is φ = 42774773938.

The previous prime is 85549547869. The next prime is 85549547879. The reversal of 85549547878 is 87874594558.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85549547879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21387386968 + ... + 21387386971.

It is an arithmetic number, because the mean of its divisors is an integer number (32081080455).

Almost surely, 2^85549547878 is an apocalyptic number.

85549547878 is a deficient number, since it is larger than the sum of its proper divisors (42774773942).

85549547878 is a wasteful number, since it uses less digits than its factorization.

85549547878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42774773941.

The product of its digits is 451584000, while the sum is 70.

The spelling of 85549547878 in words is "eighty-five billion, five hundred forty-nine million, five hundred forty-seven thousand, eight hundred seventy-eight".