71520573413 has 8 divisors (see below), whose sum is σ = 71641977048. Its totient is φ = 71399268864.

The previous prime is 71520573347. The next prime is 71520573479. The reversal of 71520573413 is 31437502517.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71520573347) and next prime (71520573479).

It can be written as a sum of positive squares in 4 ways, for example, as 731053444 + 70789519969 = 27038^2 + 266063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71520573413 - 2²⁴ = 71503796197 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 (71520573913) 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, 1498445 + ... + 1545437.

It is an arithmetic number, because the mean of its divisors is an integer number (8955247131).

Almost surely, 2^71520573413 is an apocalyptic number.

It is an amenable number.

71520573413 is a deficient number, since it is larger than the sum of its proper divisors (121403635).

71520573413 is a wasteful number, since it uses less digits than its factorization.

71520573413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49543.

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 71520573413 in words is "seventy-one billion, five hundred twenty million, five hundred seventy-three thousand, four hundred thirteen".