73581586381 has 4 divisors (see below), whose sum is σ = 73584924700. Its totient is φ = 73578248064.

The previous prime is 73581586367. The next prime is 73581586417. The reversal of 73581586381 is 18368518537.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18368518537 = 34171 ⋅537547.

It can be written as a sum of positive squares in 2 ways, for example, as 63036144900 + 10545441481 = 251070^2 + 102691^2 .

It is a cyclic number.

It is not a de Polignac number, because 73581586381 - 2³⁵ = 39221848013 is a prime.

It is a super-2 number, since 2×73581586381² (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 (73581586681) 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, 1635876 + ... + 1680253.

It is an arithmetic number, because the mean of its divisors is an integer number (18396231175).

Almost surely, 2^73581586381 is an apocalyptic number.

It is an amenable number.

73581586381 is a deficient number, since it is larger than the sum of its proper divisors (3338319).

73581586381 is a wasteful number, since it uses less digits than its factorization.

73581586381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338318.

The product of its digits is 4838400, while the sum is 55.

The spelling of 73581586381 in words is "seventy-three billion, five hundred eighty-one million, five hundred eighty-six thousand, three hundred eighty-one".