661011547585 has 8 divisors (see below), whose sum is σ = 794607909480. Its totient is φ = 527879869824.

The previous prime is 661011547579. The next prime is 661011547633. The reversal of 661011547585 is 585745110166.

It can be written as a sum of positive squares in 4 ways, for example, as 75982371201 + 585029176384 = 275649^2 + 764872^2 .

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 661011547585 - 2⁹ = 661011547073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116167902 + ... + 116173591.

It is an arithmetic number, because the mean of its divisors is an integer number (99325988685).

Almost surely, 2^661011547585 is an apocalyptic number.

It is an amenable number.

661011547585 is a deficient number, since it is larger than the sum of its proper divisors (133596361895).

661011547585 is a wasteful number, since it uses less digits than its factorization.

661011547585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232342067.

The product of its (nonzero) digits is 1008000, while the sum is 49.

The spelling of 661011547585 in words is "six hundred sixty-one billion, eleven million, five hundred forty-seven thousand, five hundred eighty-five".