66021005502 has 40 divisors (see below), whose sum is σ = 148915720272. Its totient is φ = 21861252000.

The previous prime is 66021005489. The next prime is 66021005509. The reversal of 66021005502 is 20550012066.

66021005502 is a `hidden beast` number, since 6 + 6 + 0 + 2 + 100 + 550 + 2 = 666.

It is a super-2 number, since 2×66021005502² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66021005509) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1324999 + ... + 1373922.

Almost surely, 2^66021005502 is an apocalyptic number.

66021005502 is an abundant number, since it is smaller than the sum of its proper divisors (82894714770).

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

66021005502 is a wasteful number, since it uses less digits than its factorization.

66021005502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699086 (or 2699077 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 66021005502 its reverse (20550012066), we get a palindrome (86571017568).

The spelling of 66021005502 in words is "sixty-six billion, twenty-one million, five thousand, five hundred two".