66007021371540 has 24 divisors (see below), whose sum is σ = 184819659840480. Its totient is φ = 17601872365728.

The previous prime is 66007021371437. The next prime is 66007021371601. The reversal of 66007021371540 is 4517312070066.

It is a happy number.

It is a super-4 number, since 4×66007021371540⁴ (a number of 56 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66007021371492 and 66007021371501.

It is a congruent number.

It is an unprimeable number.

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, 550058511370 + ... + 550058511489.

It is an arithmetic number, because the mean of its divisors is an integer number (7700819160020).

Almost surely, 2^{66007021371540} is an apocalyptic number.

66007021371540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66007021371540 is an abundant number, since it is smaller than the sum of its proper divisors (118812638468940).

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

66007021371540 is a wasteful number, since it uses less digits than its factorization.

66007021371540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100117022871 (or 1100117022869 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 66007021371540 in words is "sixty-six trillion, seven billion, twenty-one million, three hundred seventy-one thousand, five hundred forty".