66491630 has 8 divisors (see below), whose sum is σ = 119684952. Its totient is φ = 26596648.

The previous prime is 66491609. The next prime is 66491639. The reversal of 66491630 is 3619466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66491630² = 8842273720113800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66491639) 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 3 ways as a sum of consecutive naturals, for example, 3324572 + ... + 3324591.

It is an arithmetic number, because the mean of its divisors is an integer number (14960619).

Almost surely, 2^66491630 is an apocalyptic number.

66491630 is a deficient number, since it is larger than the sum of its proper divisors (53193322).

66491630 is a wasteful number, since it uses less digits than its factorization.

66491630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6649170.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 66491630 is about 8154.2400013735. The cubic root of 66491630 is about 405.1249525541.

The spelling of 66491630 in words is "sixty-six million, four hundred ninety-one thousand, six hundred thirty".