1660661011615 has 8 divisors (see below), whose sum is σ = 1992803123808. Its totient is φ = 1328522202720.

The previous prime is 1660661011609. The next prime is 1660661011619. The reversal of 1660661011615 is 5161101660661.

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

It is not a de Polignac number, because 1660661011615 - 2²¹ = 1660658914463 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 (1660661011619) 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, 463054 + ... + 1880356.

It is an arithmetic number, because the mean of its divisors is an integer number (249100390476).

Almost surely, 2^{1660661011615} is an apocalyptic number.

1660661011615 is a deficient number, since it is larger than the sum of its proper divisors (332142112193).

1660661011615 is a wasteful number, since it uses less digits than its factorization.

1660661011615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651649.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 1660661011615 in words is "one trillion, six hundred sixty billion, six hundred sixty-one million, eleven thousand, six hundred fifteen".