66961207 has 16 divisors (see below), whose sum is σ = 70282080. Its totient is φ = 63752832.

The previous prime is 66961183. The next prime is 66961217. The reversal of 66961207 is 70216966.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66961207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66961217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386973 + ... + 387145.

It is an arithmetic number, because the mean of its divisors is an integer number (4392630).

Almost surely, 2^66961207 is an apocalyptic number.

66961207 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66961207 is a deficient number, since it is larger than the sum of its proper divisors (3320873).

66961207 is a wasteful number, since it uses less digits than its factorization.

66961207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 66961207 is about 8182.9827691374. The cubic root of 66961207 is about 406.0764070325.

The spelling of 66961207 in words is "sixty-six million, nine hundred sixty-one thousand, two hundred seven".