66537289280 has 112 divisors (see below), whose sum is σ = 197538051456. Its totient is φ = 20738887680.

The previous prime is 66537289271. The next prime is 66537289307. The reversal of 66537289280 is 8298273566.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 1325549 + ... + 1374828.

Almost surely, 2^66537289280 is an apocalyptic number.

It is an amenable number.

66537289280 is an abundant number, since it is smaller than the sum of its proper divisors (131000762176).

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

66537289280 is a wasteful number, since it uses less digits than its factorization.

66537289280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700412 (or 2700402 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 66537289280 in words is "sixty-six billion, five hundred thirty-seven million, two hundred eighty-nine thousand, two hundred eighty".