66170072051602 has 16 divisors (see below), whose sum is σ = 105529717070712. Its totient is φ = 31009650554880.

The previous prime is 66170072051491. The next prime is 66170072051617. The reversal of 66170072051602 is 20615027007166.

It can be written as a sum of positive squares in 4 ways, for example, as 57888678788521 + 8281393263081 = 7608461^2 + 2877741^2 .

It is a super-2 number, since 2×66170072051602² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4037706723 + ... + 4037723110.

Almost surely, 2^{66170072051602} is an apocalyptic number.

66170072051602 is a deficient number, since it is larger than the sum of its proper divisors (39359645019110).

66170072051602 is a wasteful number, since it uses less digits than its factorization.

66170072051602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8075430093.

The product of its (nonzero) digits is 211680, while the sum is 43.

Adding to 66170072051602 its reverse (20615027007166), we get a palindrome (86785099058768).

The spelling of 66170072051602 in words is "sixty-six trillion, one hundred seventy billion, seventy-two million, fifty-one thousand, six hundred two".