7145806581 has 8 divisors (see below), whose sum is σ = 10586380160. Its totient is φ = 4763871036.

The previous prime is 7145806579. The next prime is 7145806583. The reversal of 7145806581 is 1856085417.

7145806581 is a `hidden beast` number, since 7 + 1 + 4 + 580 + 65 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (7145806579) and next prime (7145806583).

It is not a de Polignac number, because 7145806581 - 2¹ = 7145806579 is a prime.

It is a super-2 number, since 2×7145806581² (a number of 21 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 (7145806583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132329725 + ... + 132329778.

It is an arithmetic number, because the mean of its divisors is an integer number (1323297520).

Almost surely, 2^7145806581 is an apocalyptic number.

It is an amenable number.

7145806581 is a deficient number, since it is larger than the sum of its proper divisors (3440573579).

7145806581 is a wasteful number, since it uses less digits than its factorization.

7145806581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264659512 (or 264659506 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 7145806581 is about 84532.8727833143. The cubic root of 7145806581 is about 1926.1218248656.

The spelling of 7145806581 in words is "seven billion, one hundred forty-five million, eight hundred six thousand, five hundred eighty-one".