66475601280 has 192 divisors, whose sum is σ = 250416850320. Its totient is φ = 16115281920.

The previous prime is 66475601263. The next prime is 66475601281. The reversal of 66475601280 is 8210657466.

66475601280 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 560 + 1 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66475601281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461227 + ... + 587946.

Almost surely, 2^66475601280 is an apocalyptic number.

66475601280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66475601280 is an abundant number, since it is smaller than the sum of its proper divisors (183941249040).

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

66475601280 is a wasteful number, since it uses less digits than its factorization.

66475601280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049209 (or 1049194 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 66475601280 in words is "sixty-six billion, four hundred seventy-five million, six hundred one thousand, two hundred eighty".