66907772 has 6 divisors (see below), whose sum is σ = 117088608. Its totient is φ = 33453884.

The previous prime is 66907769. The next prime is 66907781. The reversal of 66907772 is 27770966.

It is a super-3 number, since 3×66907772³ (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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8363468 + ... + 8363475.

It is an arithmetic number, because the mean of its divisors is an integer number (19514768).

Almost surely, 2^66907772 is an apocalyptic number.

It is an amenable number.

66907772 is a deficient number, since it is larger than the sum of its proper divisors (50180836).

66907772 is a wasteful number, since it uses less digits than its factorization.

66907772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16726947 (or 16726945 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 66907772 is about 8179.7171100228. The cubic root of 66907772 is about 405.9683620505.

The spelling of 66907772 in words is "sixty-six million, nine hundred seven thousand, seven hundred seventy-two".