71140662061 has 4 divisors (see below), whose sum is σ = 81303613792. Its totient is φ = 60977710332.

The previous prime is 71140662037. The next prime is 71140662083. The reversal of 71140662061 is 16026604117.

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: 16026604117 = 157 ⋅102080281.

It is not a de Polignac number, because 71140662061 - 2¹¹ = 71140660013 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 (71140662001) 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, 5081475855 + ... + 5081475868.

It is an arithmetic number, because the mean of its divisors is an integer number (20325903448).

Almost surely, 2^71140662061 is an apocalyptic number.

It is an amenable number.

71140662061 is a deficient number, since it is larger than the sum of its proper divisors (10162951731).

71140662061 is a wasteful number, since it uses less digits than its factorization.

71140662061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10162951730.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 71140662061 in words is "seventy-one billion, one hundred forty million, six hundred sixty-two thousand, sixty-one".