71766511 has 2 divisors, whose sum is σ = 71766512. Its totient is φ = 71766510.

The previous prime is 71766493. The next prime is 71766521. The reversal of 71766511 is 11566717.

It is a strong prime.

It is an emirp because it is prime and its reverse (11566717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71766511 - 2¹⁷ = 71635439 is a prime.

It is a super-2 number, since 2×71766511² = 10300864202226242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71766521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35883255 + 35883256.

It is an arithmetic number, because the mean of its divisors is an integer number (35883256).

Almost surely, 2^71766511 is an apocalyptic number.

71766511 is a deficient number, since it is larger than the sum of its proper divisors (1).

71766511 is an equidigital number, since it uses as much as digits as its factorization.

71766511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 34.

The square root of 71766511 is about 8471.5117305001. The cubic root of 71766511 is about 415.5665769804.

The spelling of 71766511 in words is "seventy-one million, seven hundred sixty-six thousand, five hundred eleven".