66971552 has 12 divisors (see below), whose sum is σ = 131850306. Its totient is φ = 33485760.

The previous prime is 66971543. The next prime is 66971557. The reversal of 66971552 is 25517966.

It can be written as a sum of positive squares in only one way, i.e., 43507216 + 23464336 = 6596^2 + 4844^2 .

It is not an unprimeable number, because it can be changed into a prime (66971557) by changing a digit.

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 as a sum of consecutive naturals, namely, 1046399 + ... + 1046462.

Almost surely, 2^66971552 is an apocalyptic number.

It is an amenable number.

66971552 is a deficient number, since it is larger than the sum of its proper divisors (64878754).

66971552 is a wasteful number, since it uses less digits than its factorization.

66971552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092871 (or 2092863 counting only the distinct ones).

The product of its digits is 113400, while the sum is 41.

The square root of 66971552 is about 8183.6148491971. The cubic root of 66971552 is about 406.0973178668.

The spelling of 66971552 in words is "sixty-six million, nine hundred seventy-one thousand, five hundred fifty-two".