66147323640 has 32 divisors (see below), whose sum is σ = 198441971280. Its totient is φ = 17639286272.

The previous prime is 66147323621. The next prime is 66147323677. The reversal of 66147323640 is 4632374166.

It is a super-3 number, since 3×66147323640³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66147323592 and 66147323601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275613729 + ... + 275613968.

Almost surely, 2^66147323640 is an apocalyptic number.

66147323640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66147323640 is an abundant number, since it is smaller than the sum of its proper divisors (132294647640).

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

66147323640 is a wasteful number, since it uses less digits than its factorization.

66147323640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551227711 (or 551227707 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 42.

The spelling of 66147323640 in words is "sixty-six billion, one hundred forty-seven million, three hundred twenty-three thousand, six hundred forty".