66997100 has 18 divisors (see below), whose sum is σ = 145383924. Its totient is φ = 26798800.

The previous prime is 66997069. The next prime is 66997103. The reversal of 66997100 is 179966.

It is a super-2 number, since 2×66997100² = 8977222816820000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66997103) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 334886 + ... + 335085.

Almost surely, 2^66997100 is an apocalyptic number.

It is an amenable number.

66997100 is an abundant number, since it is smaller than the sum of its proper divisors (78386824).

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

66997100 is a wasteful number, since it uses less digits than its factorization.

66997100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669985 (or 669978 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 66997100 is about 8185.1756242612. The cubic root of 66997100 is about 406.1489500150.

The spelling of 66997100 in words is "sixty-six million, nine hundred ninety-seven thousand, one hundred".