71711661 has 64 divisors (see below), whose sum is σ = 122135040. Its totient is φ = 36495360.

The previous prime is 71711621. The next prime is 71711663. The reversal of 71711661 is 16611717.

It is not a de Polignac number, because 71711661 - 2¹⁴ = 71695277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71711663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 805705 + ... + 805793.

It is an arithmetic number, because the mean of its divisors is an integer number (1908360).

Almost surely, 2^71711661 is an apocalyptic number.

It is an amenable number.

71711661 is a deficient number, since it is larger than the sum of its proper divisors (50423379).

71711661 is a wasteful number, since it uses less digits than its factorization.

71711661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214.

The product of its digits is 1764, while the sum is 30.

The square root of 71711661 is about 8468.2737910391. The cubic root of 71711661 is about 415.4606796945.

The spelling of 71711661 in words is "seventy-one million, seven hundred eleven thousand, six hundred sixty-one".