85797978047 has 4 divisors (see below), whose sum is σ = 86175942936. Its totient is φ = 85420013160.

The previous prime is 85797977983. The next prime is 85797978053. The reversal of 85797978047 is 74087979758.

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

It is a cyclic number.

It is not a de Polignac number, because 85797978047 - 2⁶ = 85797977983 is a prime.

It is a super-2 number, since 2×85797978047² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85797978547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188982104 + ... + 188982557.

It is an arithmetic number, because the mean of its divisors is an integer number (21543985734).

Almost surely, 2^85797978047 is an apocalyptic number.

85797978047 is a deficient number, since it is larger than the sum of its proper divisors (377964889).

85797978047 is a wasteful number, since it uses less digits than its factorization.

85797978047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377964888.

The product of its (nonzero) digits is 248935680, while the sum is 71.

The spelling of 85797978047 in words is "eighty-five billion, seven hundred ninety-seven million, nine hundred seventy-eight thousand, forty-seven".