66751992 has 32 divisors (see below), whose sum is σ = 185422800. Its totient is φ = 22250592.

The previous prime is 66751981. The next prime is 66752009. The reversal of 66751992 is 29915766.

It is a happy number.

It is a super-3 number, since 3×66751992³ (a number of 24 digits) contains 333 as substring.

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, 154303 + ... + 154734.

Almost surely, 2^66751992 is an apocalyptic number.

It is an amenable number.

66751992 is an abundant number, since it is smaller than the sum of its proper divisors (118670808).

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

66751992 is a wasteful number, since it uses less digits than its factorization.

66751992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309052 (or 309042 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 66751992 is about 8170.1892266948. The cubic root of 66751992 is about 405.6530479266.

The spelling of 66751992 in words is "sixty-six million, seven hundred fifty-one thousand, nine hundred ninety-two".