71668361 has 4 divisors (see below), whose sum is σ = 75440400. Its totient is φ = 67896324.

The previous prime is 71668343. The next prime is 71668393. The reversal of 71668361 is 16386617.

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: 16386617 = 13 ⋅1260509.

It is a cyclic number.

It is not a de Polignac number, because 71668361 - 2¹⁴ = 71651977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71668301) 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, 1885991 + ... + 1886028.

It is an arithmetic number, because the mean of its divisors is an integer number (18860100).

Almost surely, 2^71668361 is an apocalyptic number.

It is an amenable number.

71668361 is a deficient number, since it is larger than the sum of its proper divisors (3772039).

71668361 is a wasteful number, since it uses less digits than its factorization.

71668361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3772038.

The product of its digits is 36288, while the sum is 38.

The square root of 71668361 is about 8465.7168036735. The cubic root of 71668361 is about 415.3770435089.

The spelling of 71668361 in words is "seventy-one million, six hundred sixty-eight thousand, three hundred sixty-one".