66600737280 has 1440 divisors, whose sum is σ = 303896406528. Its totient is φ = 13315276800.

The previous prime is 66600737237. The next prime is 66600737309. The reversal of 66600737280 is 8273700666.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 384975274 + ... + 384975446.

Almost surely, 2^66600737280 is an apocalyptic number.

66600737280 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 66600737280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151948203264).

66600737280 is an abundant number, since it is smaller than the sum of its proper divisors (237295669248).

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

66600737280 is a wasteful number, since it uses less digits than its factorization.

66600737280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 66600737280 in words is "sixty-six billion, six hundred million, seven hundred thirty-seven thousand, two hundred eighty".