71966819 has 2 divisors, whose sum is σ = 71966820. Its totient is φ = 71966818.

The previous prime is 71966761. The next prime is 71966837. The reversal of 71966819 is 91866917.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71966819 is a prime.

It is a super-2 number, since 2×71966819² = 10358446073957522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (71966879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35983409 + 35983410.

It is an arithmetic number, because the mean of its divisors is an integer number (35983410).

Almost surely, 2^71966819 is an apocalyptic number.

71966819 is a deficient number, since it is larger than the sum of its proper divisors (1).

71966819 is an equidigital number, since it uses as much as digits as its factorization.

71966819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 71966819 is about 8483.3259397479. The cubic root of 71966819 is about 415.9528480673.

The spelling of 71966819 in words is "seventy-one million, nine hundred sixty-six thousand, eight hundred nineteen".