2661651216215 has 8 divisors (see below), whose sum is σ = 3201568116288. Its totient is φ = 2124263201760.

The previous prime is 2661651216187. The next prime is 2661651216233. The reversal of 2661651216215 is 5126121561662.

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

It is not a de Polignac number, because 2661651216215 - 2¹⁰ = 2661651215191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632219087 + ... + 632223296.

It is an arithmetic number, because the mean of its divisors is an integer number (400196014536).

Almost surely, 2^{2661651216215} is an apocalyptic number.

2661651216215 is a deficient number, since it is larger than the sum of its proper divisors (539916900073).

2661651216215 is a wasteful number, since it uses less digits than its factorization.

2661651216215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264442809.

The product of its digits is 259200, while the sum is 44.

Adding to 2661651216215 its reverse (5126121561662), we get a palindrome (7787772777877).

The spelling of 2661651216215 in words is "two trillion, six hundred sixty-one billion, six hundred fifty-one million, two hundred sixteen thousand, two hundred fifteen".