66261432460 has 12 divisors (see below), whose sum is σ = 139149008208. Its totient is φ = 26504572976.

The previous prime is 66261432439. The next prime is 66261432473. The reversal of 66261432460 is 6423416266.

It is a super-2 number, since 2×66261432460² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656535792 + ... + 1656535831.

It is an arithmetic number, because the mean of its divisors is an integer number (11595750684).

Almost surely, 2^66261432460 is an apocalyptic number.

It is an amenable number.

66261432460 is an abundant number, since it is smaller than the sum of its proper divisors (72887575748).

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

66261432460 is a wasteful number, since it uses less digits than its factorization.

66261432460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3313071632 (or 3313071630 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 66261432460 in words is "sixty-six billion, two hundred sixty-one million, four hundred thirty-two thousand, four hundred sixty".