661544133485 has 8 divisors (see below), whose sum is σ = 793863958680. Its totient is φ = 529227974464.

The previous prime is 661544133469. The next prime is 661544133553. The reversal of 661544133485 is 584331445166.

It can be written as a sum of positive squares in 4 ways, for example, as 6889996036 + 654654137449 = 83006^2 + 809107^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 661544133485 - 2⁴ = 661544133469 is a prime.

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, 502562 + ... + 1255251.

It is an arithmetic number, because the mean of its divisors is an integer number (99232994835).

Almost surely, 2^661544133485 is an apocalyptic number.

It is an amenable number.

661544133485 is a deficient number, since it is larger than the sum of its proper divisors (132319825195).

661544133485 is a wasteful number, since it uses less digits than its factorization.

661544133485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833087.

The product of its digits is 4147200, while the sum is 50.

The spelling of 661544133485 in words is "six hundred sixty-one billion, five hundred forty-four million, one hundred thirty-three thousand, four hundred eighty-five".