66971996 has 36 divisors (see below), whose sum is σ = 145050192. Its totient is φ = 26492544.

The previous prime is 66971951. The next prime is 66971999. The reversal of 66971996 is 69917966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66971999) 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, 2345 + ... + 11808.

It is an arithmetic number, because the mean of its divisors is an integer number (4029172).

Almost surely, 2^66971996 is an apocalyptic number.

It is an amenable number.

66971996 is an abundant number, since it is smaller than the sum of its proper divisors (78078196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66971996 is a wasteful number, since it uses less digits than its factorization.

66971996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14190 (or 14175 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 53.

The square root of 66971996 is about 8183.6419765285. The cubic root of 66971996 is about 406.0982152967.

The spelling of 66971996 in words is "sixty-six million, nine hundred seventy-one thousand, nine hundred ninety-six".