66429905280 has 128 divisors (see below), whose sum is σ = 216250836480. Its totient is φ = 17337710592.

The previous prime is 66429905263. The next prime is 66429905287. The reversal of 66429905280 is 8250992466.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66429905287) 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, 277834 + ... + 458313.

It is an arithmetic number, because the mean of its divisors is an integer number (1689459660).

Almost surely, 2^66429905280 is an apocalyptic number.

66429905280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66429905280 is an abundant number, since it is smaller than the sum of its proper divisors (149820931200).

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

66429905280 is a wasteful number, since it uses less digits than its factorization.

66429905280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736216 (or 736204 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 66429905280 in words is "sixty-six billion, four hundred twenty-nine million, nine hundred five thousand, two hundred eighty".