2015666646511 has 4 divisors (see below), whose sum is σ = 2303619024592. Its totient is φ = 1727714268432.

The previous prime is 2015666646493. The next prime is 2015666646523. The reversal of 2015666646511 is 1156466665102.

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

It is a cyclic number.

It is not a de Polignac number, because 2015666646511 - 2¹⁷ = 2015666515439 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 (2015666646211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143976189030 + ... + 143976189043.

It is an arithmetic number, because the mean of its divisors is an integer number (575904756148).

Almost surely, 2^{2015666646511} is an apocalyptic number.

2015666646511 is a deficient number, since it is larger than the sum of its proper divisors (287952378081).

2015666646511 is an equidigital number, since it uses as much as digits as its factorization.

2015666646511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287952378080.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 2015666646511 in words is "two trillion, fifteen billion, six hundred sixty-six million, six hundred forty-six thousand, five hundred eleven".