66142031280 has 80 divisors (see below), whose sum is σ = 220812637920. Its totient is φ = 16281114624.

The previous prime is 66142031261. The next prime is 66142031309. The reversal of 66142031280 is 8213024166.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10596565 + ... + 10602804.

It is an arithmetic number, because the mean of its divisors is an integer number (2760157974).

Almost surely, 2^66142031280 is an apocalyptic number.

66142031280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66142031280 is an abundant number, since it is smaller than the sum of its proper divisors (154670606640).

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

66142031280 is a wasteful number, since it uses less digits than its factorization.

66142031280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21199398 (or 21199392 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 66142031280 in words is "sixty-six billion, one hundred forty-two million, thirty-one thousand, two hundred eighty".