66076721202644 has 48 divisors (see below), whose sum is σ = 117252991715328. Its totient is φ = 32578749950688.

The previous prime is 66076721202643. The next prime is 66076721202761. The reversal of 66076721202644 is 44620212767066.

It is a super-2 number, since 2×66076721202644² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66076721202643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851608019 + ... + 851685605.

It is an arithmetic number, because the mean of its divisors is an integer number (2442770660736).

Almost surely, 2^{66076721202644} is an apocalyptic number.

It is an amenable number.

66076721202644 is a deficient number, since it is larger than the sum of its proper divisors (51176270512684).

66076721202644 is a wasteful number, since it uses less digits than its factorization.

66076721202644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86844 (or 86842 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 53.

The spelling of 66076721202644 in words is "sixty-six trillion, seventy-six billion, seven hundred twenty-one million, two hundred two thousand, six hundred forty-four".