71757307645 has 8 divisors (see below), whose sum is σ = 87733463256. Its totient is φ = 56322716736.

The previous prime is 71757307639. The next prime is 71757307667. The reversal of 71757307645 is 54670375717.

It can be written as a sum of positive squares in 4 ways, for example, as 33489732004 + 38267575641 = 183002^2 + 195621^2 .

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 71757307645 - 2³ = 71757307637 is a prime.

It is a super-2 number, since 2×71757307645² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71757307592 and 71757307601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135390882 + ... + 135391411.

It is an arithmetic number, because the mean of its divisors is an integer number (10966682907).

Almost surely, 2^71757307645 is an apocalyptic number.

It is an amenable number.

71757307645 is a deficient number, since it is larger than the sum of its proper divisors (15976155611).

71757307645 is a wasteful number, since it uses less digits than its factorization.

71757307645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270782351.

The product of its (nonzero) digits is 4321800, while the sum is 52.

The spelling of 71757307645 in words is "seventy-one billion, seven hundred fifty-seven million, three hundred seven thousand, six hundred forty-five".