66123954 has 36 divisors (see below), whose sum is σ = 155144106. Its totient is φ = 20344896.

The previous prime is 66123943. The next prime is 66123977. The reversal of 66123954 is 45932166.

It is a happy number.

66123954 is a `hidden beast` number, since 6 + 612 + 39 + 5 + 4 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 16040025 + 50083929 = 4005^2 + 7077^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7827 + ... + 13910.

Almost surely, 2^66123954 is an apocalyptic number.

66123954 is an abundant number, since it is smaller than the sum of its proper divisors (89020152).

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

66123954 is a wasteful number, since it uses less digits than its factorization.

66123954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21771 (or 21755 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 66123954 is about 8131.6636674176. The cubic root of 66123954 is about 404.3768377169.

The spelling of 66123954 in words is "sixty-six million, one hundred twenty-three thousand, nine hundred fifty-four".