84521591073 has 40 divisors (see below), whose sum is σ = 128050462848. Its totient is φ = 55553423616.

The previous prime is 84521591059. The next prime is 84521591081. The reversal of 84521591073 is 37019512548.

84521591073 is a `hidden beast` number, since 8 + 4 + 52 + 1 + 591 + 0 + 7 + 3 = 666.

It is not a de Polignac number, because 84521591073 - 2⁴ = 84521591057 is a prime.

It is a super-2 number, since 2×84521591073² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84521591023) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2045940 + ... + 2086842.

Almost surely, 2^84521591073 is an apocalyptic number.

It is an amenable number.

84521591073 is a deficient number, since it is larger than the sum of its proper divisors (43528871775).

84521591073 is a wasteful number, since it uses less digits than its factorization.

84521591073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41275 (or 41266 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 84521591073 in words is "eighty-four billion, five hundred twenty-one million, five hundred ninety-one thousand, seventy-three".