661631005333146 has 32 divisors (see below), whose sum is σ = 1379309816715840. Its totient is φ = 211380296979456.

The previous prime is 661631005333121. The next prime is 661631005333159. The reversal of 661631005333146 is 641333500136166.

It is a junction number, because it is equal to n+sod(n) for n = 661631005333095 and 661631005333104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22241177991 + ... + 22241207738.

It is an arithmetic number, because the mean of its divisors is an integer number (43103431772370).

Almost surely, 2^{661631005333146} is an apocalyptic number.

661631005333146 is an abundant number, since it is smaller than the sum of its proper divisors (717678811382694).

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

661631005333146 is a wasteful number, since it uses less digits than its factorization.

661631005333146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44482385838.

The product of its (nonzero) digits is 2099520, while the sum is 48.

The spelling of 661631005333146 in words is "six hundred sixty-one trillion, six hundred thirty-one billion, five million, three hundred thirty-three thousand, one hundred forty-six".