66777954 has 16 divisors (see below), whose sum is σ = 133660992. Its totient is φ = 22241808.

The previous prime is 66777943. The next prime is 66777979. The reversal of 66777954 is 45977766.

It is a super-2 number, since 2×66777954² = 8918590280852232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66777897 and 66777906.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5652 + ... + 12864.

It is an arithmetic number, because the mean of its divisors is an integer number (8353812).

Almost surely, 2^66777954 is an apocalyptic number.

66777954 is an abundant number, since it is smaller than the sum of its proper divisors (66883038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66777954 is a wasteful number, since it uses less digits than its factorization.

66777954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8761.

The product of its digits is 2222640, while the sum is 51.

The square root of 66777954 is about 8171.7778971286. Note that the first 3 decimals coincide. The cubic root of 66777954 is about 405.7056316227.

The spelling of 66777954 in words is "sixty-six million, seven hundred seventy-seven thousand, nine hundred fifty-four".