2611666515551 has 4 divisors (see below), whose sum is σ = 2626095612504. Its totient is φ = 2597237418600.

The previous prime is 2611666515529. The next prime is 2611666515559. The reversal of 2611666515551 is 1555156661162.

2611666515551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2611666515551 - 2⁶ = 2611666515487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2611666515551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2611666515559) 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, 7214548205 + ... + 7214548566.

It is an arithmetic number, because the mean of its divisors is an integer number (656523903126).

Almost surely, 2^{2611666515551} is an apocalyptic number.

2611666515551 is a deficient number, since it is larger than the sum of its proper divisors (14429096953).

2611666515551 is a wasteful number, since it uses less digits than its factorization.

2611666515551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14429096952.

The product of its digits is 1620000, while the sum is 50.

The spelling of 2611666515551 in words is "two trillion, six hundred eleven billion, six hundred sixty-six million, five hundred fifteen thousand, five hundred fifty-one".