71661667 has 12 divisors (see below), whose sum is σ = 90940536. Its totient is φ = 55839840.

The previous prime is 71661661. The next prime is 71661679. The reversal of 71661667 is 76616617.

It is a de Polignac number, because none of the positive numbers 2^k-71661667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71661661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65938 + ... + 67015.

It is an arithmetic number, because the mean of its divisors is an integer number (7578378).

Almost surely, 2^71661667 is an apocalyptic number.

71661667 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

71661667 is a deficient number, since it is larger than the sum of its proper divisors (19278869).

71661667 is a wasteful number, since it uses less digits than its factorization.

71661667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132978 (or 132971 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 71661667 is about 8465.3214351258. The cubic root of 71661667 is about 415.3641106960.

The spelling of 71661667 in words is "seventy-one million, six hundred sixty-one thousand, six hundred sixty-seven".