661511034859 has 8 divisors (see below), whose sum is σ = 672517863648. Its totient is φ = 650551144320.

The previous prime is 661511034851. The next prime is 661511034869. The reversal of 661511034859 is 958430115166.

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 661511034859 - 2³ = 661511034851 is a prime.

It is a super-2 number, since 2×661511034859² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661511034851) by changing a digit.

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, 11706142 + ... + 11762515.

It is an arithmetic number, because the mean of its divisors is an integer number (84064732956).

Almost surely, 2^661511034859 is an apocalyptic number.

661511034859 is a deficient number, since it is larger than the sum of its proper divisors (11006828789).

661511034859 is a wasteful number, since it uses less digits than its factorization.

661511034859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23469125.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 661511034859 in words is "six hundred sixty-one billion, five hundred eleven million, thirty-four thousand, eight hundred fifty-nine".