66220761060 has 144 divisors (see below), whose sum is σ = 208590572736. Its totient is φ = 17635024512.

The previous prime is 66220761053. The next prime is 66220761071. The reversal of 66220761060 is 6016702266.

It is a super-2 number, since 2×66220761060² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3747967 + ... + 3765593.

It is an arithmetic number, because the mean of its divisors is an integer number (1448545644).

Almost surely, 2^66220761060 is an apocalyptic number.

66220761060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66220761060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104295286368).

66220761060 is an abundant number, since it is smaller than the sum of its proper divisors (142369811676).

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

66220761060 is a wasteful number, since it uses less digits than its factorization.

66220761060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18424 (or 18410 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 66220761060 in words is "sixty-six billion, two hundred twenty million, seven hundred sixty-one thousand, sixty".