85379698981 has 4 divisors (see below), whose sum is σ = 85409839372. Its totient is φ = 85349558592.

The previous prime is 85379698969. The next prime is 85379698991. The reversal of 85379698981 is 18989697358.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14487973956 + 70891725025 = 120366^2 + 266255^2 .

It is a cyclic number.

It is not a de Polignac number, because 85379698981 - 2¹³ = 85379690789 is a prime.

It is a super-2 number, since 2×85379698981² (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 (85379698931) 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, 15065946 + ... + 15071611.

It is an arithmetic number, because the mean of its divisors is an integer number (21352459843).

Almost surely, 2^85379698981 is an apocalyptic number.

It is an amenable number.

85379698981 is a deficient number, since it is larger than the sum of its proper divisors (30140391).

85379698981 is a wasteful number, since it uses less digits than its factorization.

85379698981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30140390.

The product of its digits is 235146240, while the sum is 73.

The spelling of 85379698981 in words is "eighty-five billion, three hundred seventy-nine million, six hundred ninety-eight thousand, nine hundred eighty-one".