71406623659537 has 8 divisors (see below), whose sum is σ = 72760430632104. Its totient is φ = 70053057879168.

The previous prime is 71406623659531. The next prime is 71406623659583. The reversal of 71406623659537 is 73595632660417.

It is a happy number.

It is a Cunningham number, because it is equal to 8450244²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 33431338976256 + 37975284683281 = 5781984^2 + 6162409^2 .

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 71406623659537 - 2³ = 71406623659529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71406623659531) 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, 59700268 + ... + 60884605.

It is an arithmetic number, because the mean of its divisors is an integer number (9095053829013).

Almost surely, 2^{71406623659537} is an apocalyptic number.

It is an amenable number.

71406623659537 is a deficient number, since it is larger than the sum of its proper divisors (1353806972567).

71406623659537 is a wasteful number, since it uses less digits than its factorization.

71406623659537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120596099.

The product of its (nonzero) digits is 171460800, while the sum is 64.

The spelling of 71406623659537 in words is "seventy-one trillion, four hundred six billion, six hundred twenty-three million, six hundred fifty-nine thousand, five hundred thirty-seven".