661249546333 has 4 divisors (see below), whose sum is σ = 661978598560. Its totient is φ = 660520494108.

The previous prime is 661249546289. The next prime is 661249546351. The reversal of 661249546333 is 333645942166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 661249546333 - 2⁹ = 661249545821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661249556333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364524753 + ... + 364526566.

It is an arithmetic number, because the mean of its divisors is an integer number (165494649640).

Almost surely, 2^661249546333 is an apocalyptic number.

It is an amenable number.

661249546333 is a deficient number, since it is larger than the sum of its proper divisors (729052227).

661249546333 is an equidigital number, since it uses as much as digits as its factorization.

661249546333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729052226.

The product of its digits is 8398080, while the sum is 52.

The spelling of 661249546333 in words is "six hundred sixty-one billion, two hundred forty-nine million, five hundred forty-six thousand, three hundred thirty-three".