66533938 has 4 divisors (see below), whose sum is σ = 99800910. Its totient is φ = 33266968.

The previous prime is 66533933. The next prime is 66533941. The reversal of 66533938 is 83933566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 485809 = 8127^2 + 697^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66533894 and 66533903.

It is not an unprimeable number, because it can be changed into a prime (66533933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16633483 + ... + 16633486.

Almost surely, 2^66533938 is an apocalyptic number.

66533938 is a deficient number, since it is larger than the sum of its proper divisors (33266972).

66533938 is a wasteful number, since it uses less digits than its factorization.

66533938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33266971.

The product of its digits is 349920, while the sum is 43.

The square root of 66533938 is about 8156.8338220170. The cubic root of 66533938 is about 405.2108600708.

The spelling of 66533938 in words is "sixty-six million, five hundred thirty-three thousand, nine hundred thirty-eight".