66877946 has 16 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 33012000.

The previous prime is 66877919. The next prime is 66877957. The reversal of 66877946 is 64977866.

It is a happy number.

It is a super-2 number, since 2×66877946² = 8945319322357832, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 63230 + ... + 64278.

It is an arithmetic number, because the mean of its divisors is an integer number (6350400).

Almost surely, 2^66877946 is an apocalyptic number.

66877946 is a deficient number, since it is larger than the sum of its proper divisors (34728454).

66877946 is a wasteful number, since it uses less digits than its factorization.

66877946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429.

The product of its digits is 3048192, while the sum is 53.

The square root of 66877946 is about 8177.8937386102. The cubic root of 66877946 is about 405.9080291889.

The spelling of 66877946 in words is "sixty-six million, eight hundred seventy-seven thousand, nine hundred forty-six".