71661679 has 2 divisors, whose sum is σ = 71661680. Its totient is φ = 71661678.

The previous prime is 71661661. The next prime is 71661743. The reversal of 71661679 is 97616617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71661679 - 2⁹ = 71661167 is a prime.

It is a super-3 number, since 3×71661679³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71661379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35830839 + 35830840.

It is an arithmetic number, because the mean of its divisors is an integer number (35830840).

Almost surely, 2^71661679 is an apocalyptic number.

71661679 is a deficient number, since it is larger than the sum of its proper divisors (1).

71661679 is an equidigital number, since it uses as much as digits as its factorization.

71661679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 71661679 is about 8465.3221438998. The cubic root of 71661679 is about 415.3641338807.

The spelling of 71661679 in words is "seventy-one million, six hundred sixty-one thousand, six hundred seventy-nine".