11211100661615 has 4 divisors (see below), whose sum is σ = 13453320793944. Its totient is φ = 8968880529288.

The previous prime is 11211100661603. The next prime is 11211100661647. The reversal of 11211100661615 is 51616600111211.

11211100661615 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 11211100661615 - 2¹⁶ = 11211100596079 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 3 ways as a sum of consecutive naturals, for example, 1121110066157 + ... + 1121110066166.

It is an arithmetic number, because the mean of its divisors is an integer number (3363330198486).

Almost surely, 2^{11211100661615} is an apocalyptic number.

11211100661615 is a deficient number, since it is larger than the sum of its proper divisors (2242220132329).

11211100661615 is an equidigital number, since it uses as much as digits as its factorization.

11211100661615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242220132328.

The product of its (nonzero) digits is 2160, while the sum is 32.

Adding to 11211100661615 its reverse (51616600111211), we get a palindrome (62827700772826).

The spelling of 11211100661615 in words is "eleven trillion, two hundred eleven billion, one hundred million, six hundred sixty-one thousand, six hundred fifteen".