71456661 has 20 divisors (see below), whose sum is σ = 113025132. Its totient is φ = 44834688.

The previous prime is 71456659. The next prime is 71456719. The reversal of 71456661 is 16665417.

It can be written as a sum of positive squares in 2 ways, for example, as 28291761 + 43164900 = 5319^2 + 6570^2 .

It is not a de Polignac number, because 71456661 - 2¹ = 71456659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71456641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24570 + ... + 27323.

Almost surely, 2^71456661 is an apocalyptic number.

It is an amenable number.

71456661 is a deficient number, since it is larger than the sum of its proper divisors (41568471).

71456661 is a wasteful number, since it uses less digits than its factorization.

71456661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51922 (or 51913 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 71456661 is about 8453.2041853962. The cubic root of 71456661 is about 414.9676483224.

It can be divided in two parts, 714 and 56661, that added together give a palindrome (57375).

The spelling of 71456661 in words is "seventy-one million, four hundred fifty-six thousand, six hundred sixty-one".