66155515060 has 24 divisors (see below), whose sum is σ = 139124794536. Its totient is φ = 26424451200.

The previous prime is 66155515051. The next prime is 66155515067. The reversal of 66155515060 is 6051555166.

It can be written as a sum of positive squares in 4 ways, for example, as 16254210064 + 49901304996 = 127492^2 + 223386^2 .

It is a super-3 number, since 3×66155515060³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66155515067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2345307 + ... + 2373346.

It is an arithmetic number, because the mean of its divisors is an integer number (5796866439).

Almost surely, 2^66155515060 is an apocalyptic number.

It is an amenable number.

66155515060 is an abundant number, since it is smaller than the sum of its proper divisors (72969279476).

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

66155515060 is a wasteful number, since it uses less digits than its factorization.

66155515060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4719363 (or 4719361 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 66155515060 in words is "sixty-six billion, one hundred fifty-five million, five hundred fifteen thousand, sixty".