66991130 has 16 divisors (see below), whose sum is σ = 123525864. Its totient is φ = 26142720.

The previous prime is 66991117. The next prime is 66991163. The reversal of 66991130 is 3119966.

It can be written as a sum of positive squares in 4 ways, for example, as 17048641 + 49942489 = 4129^2 + 7067^2 .

It is a super-2 number, since 2×66991130² = 8975622997353800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81287 + ... + 82106.

Almost surely, 2^66991130 is an apocalyptic number.

66991130 is a deficient number, since it is larger than the sum of its proper divisors (56534734).

66991130 is a wasteful number, since it uses less digits than its factorization.

66991130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163441.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 66991130 is about 8184.8109324529. The cubic root of 66991130 is about 406.1368859045.

The spelling of 66991130 in words is "sixty-six million, nine hundred ninety-one thousand, one hundred thirty".