9661585412587 has 4 divisors (see below), whose sum is σ = 9664931998576. Its totient is φ = 9658238826600.

The previous prime is 9661585412537. The next prime is 9661585412599. The reversal of 9661585412587 is 7852145851669.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9661585412587 is a prime.

It is a super-2 number, since 2×9661585412587² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9661585412537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1673288664 + ... + 1673294437.

It is an arithmetic number, because the mean of its divisors is an integer number (2416232999644).

Almost surely, 2^{9661585412587} is an apocalyptic number.

9661585412587 is a deficient number, since it is larger than the sum of its proper divisors (3346585989).

9661585412587 is a wasteful number, since it uses less digits than its factorization.

9661585412587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346585988.

The product of its digits is 145152000, while the sum is 67.

The spelling of 9661585412587 in words is "nine trillion, six hundred sixty-one billion, five hundred eighty-five million, four hundred twelve thousand, five hundred eighty-seven".