66737977488 has 400 divisors, whose sum is σ = 239181524736. Its totient is φ = 17494133760.

The previous prime is 66737977457. The next prime is 66737977541. The reversal of 66737977488 is 88477973766.

66737977488 is a `hidden beast` number, since 6 + 6 + 7 + 3 + 79 + 77 + 488 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20401293 + ... + 20404563.

Almost surely, 2^66737977488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66737977488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119590762368).

66737977488 is an abundant number, since it is smaller than the sum of its proper divisors (172443547248).

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

66737977488 is a wasteful number, since it uses less digits than its factorization.

66737977488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3484 (or 3469 counting only the distinct ones).

The product of its digits is 597445632, while the sum is 72.

The spelling of 66737977488 in words is "sixty-six billion, seven hundred thirty-seven million, nine hundred seventy-seven thousand, four hundred eighty-eight".