85437899221 has 4 divisors (see below), whose sum is σ = 87255726912. Its totient is φ = 83620071532.

The previous prime is 85437899219. The next prime is 85437899231. The reversal of 85437899221 is 12299873458.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85437899221 - 2¹ = 85437899219 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85437899231) 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, 908913775 + ... + 908913868.

It is an arithmetic number, because the mean of its divisors is an integer number (21813931728).

Almost surely, 2^85437899221 is an apocalyptic number.

It is an amenable number.

85437899221 is a deficient number, since it is larger than the sum of its proper divisors (1817827691).

85437899221 is a wasteful number, since it uses less digits than its factorization.

85437899221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817827690.

The product of its digits is 8709120, while the sum is 58.

The spelling of 85437899221 in words is "eighty-five billion, four hundred thirty-seven million, eight hundred ninety-nine thousand, two hundred twenty-one".