66949146572 has 144 divisors (see below), whose sum is σ = 148870385664. Its totient is φ = 25786252800.

The previous prime is 66949146527. The next prime is 66949146601. The reversal of 66949146572 is 27564194966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198661988 + ... + 198662324.

Almost surely, 2^66949146572 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 66949146572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74435192832).

66949146572 is an abundant number, since it is smaller than the sum of its proper divisors (81921239092).

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

66949146572 is a wasteful number, since it uses less digits than its factorization.

66949146572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 855 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 59.

The spelling of 66949146572 in words is "sixty-six billion, nine hundred forty-nine million, one hundred forty-six thousand, five hundred seventy-two".