66997902 has 16 divisors (see below), whose sum is σ = 134077392. Its totient is φ = 22319040.

The previous prime is 66997871. The next prime is 66997921. The reversal of 66997902 is 20979966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14652 + ... + 18672.

It is an arithmetic number, because the mean of its divisors is an integer number (8379837).

Almost surely, 2^66997902 is an apocalyptic number.

66997902 is an abundant number, since it is smaller than the sum of its proper divisors (67079490).

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

66997902 is a wasteful number, since it uses less digits than its factorization.

66997902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 66997902 is about 8185.2246151221. The cubic root of 66997902 is about 406.1505706332.

The spelling of 66997902 in words is "sixty-six million, nine hundred ninety-seven thousand, nine hundred two".