71818262131493 has 4 divisors (see below), whose sum is σ = 71942730523980. Its totient is φ = 71693793739008.

The previous prime is 71818262131471. The next prime is 71818262131523. The reversal of 71818262131493 is 39413126281817.

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 51273590871364 + 20544671260129 = 7160558^2 + 4532623^2 .

It is a cyclic number.

It is not a de Polignac number, because 71818262131493 - 2³² = 71813967164197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71818262131403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62234195378 + ... + 62234196531.

It is an arithmetic number, because the mean of its divisors is an integer number (17985682630995).

Almost surely, 2^{71818262131493} is an apocalyptic number.

It is an amenable number.

71818262131493 is a deficient number, since it is larger than the sum of its proper divisors (124468392487).

71818262131493 is a wasteful number, since it uses less digits than its factorization.

71818262131493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124468392486.

The product of its digits is 3483648, while the sum is 56.

The spelling of 71818262131493 in words is "seventy-one trillion, eight hundred eighteen billion, two hundred sixty-two million, one hundred thirty-one thousand, four hundred ninety-three".