66461439909426 has 8 divisors (see below), whose sum is σ = 132922879818864. Its totient is φ = 22153813303140.

The previous prime is 66461439909413. The next prime is 66461439909479. The reversal of 66461439909426 is 62490993416466.

It is a sphenic number, since it is the product of 3 distinct primes.

66461439909426 is an admirable number.

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, 5538453325780 + ... + 5538453325791.

It is an arithmetic number, because the mean of its divisors is an integer number (16615359977358).

Almost surely, 2^{66461439909426} is an apocalyptic number.

66461439909426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66461439909426 is a wasteful number, since it uses less digits than its factorization.

66461439909426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076906651576.

The product of its (nonzero) digits is 362797056, while the sum is 69.

The spelling of 66461439909426 in words is "sixty-six trillion, four hundred sixty-one billion, four hundred thirty-nine million, nine hundred nine thousand, four hundred twenty-six".