66537970 has 8 divisors (see below), whose sum is σ = 119768364. Its totient is φ = 26615184.

The previous prime is 66537959. The next prime is 66537971. The reversal of 66537970 is 7973566.

It can be written as a sum of positive squares in 2 ways, for example, as 66406201 + 131769 = 8149^2 + 363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66537971) 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 in 3 ways as a sum of consecutive naturals, for example, 3326889 + ... + 3326908.

Almost surely, 2^66537970 is an apocalyptic number.

66537970 is a deficient number, since it is larger than the sum of its proper divisors (53230394).

66537970 is a wasteful number, since it uses less digits than its factorization.

66537970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6653804.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 66537970 is about 8157.0809729952. The cubic root of 66537970 is about 405.2190452528.

The spelling of 66537970 in words is "sixty-six million, five hundred thirty-seven thousand, nine hundred seventy".