71542815061 has 4 divisors (see below), whose sum is σ = 75308226400. Its totient is φ = 67777403724.

The previous prime is 71542815059. The next prime is 71542815101. The reversal of 71542815061 is 16051824517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16051824517 = 5867 ⋅2735951.

It is a cyclic number.

It is not a de Polignac number, because 71542815061 - 2¹ = 71542815059 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 (71542815361) 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, 1882705641 + ... + 1882705678.

It is an arithmetic number, because the mean of its divisors is an integer number (18827056600).

Almost surely, 2^71542815061 is an apocalyptic number.

It is an amenable number.

71542815061 is a deficient number, since it is larger than the sum of its proper divisors (3765411339).

71542815061 is a wasteful number, since it uses less digits than its factorization.

71542815061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765411338.

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 71542815061 in words is "seventy-one billion, five hundred forty-two million, eight hundred fifteen thousand, sixty-one".