1215455153111 has 4 divisors (see below), whose sum is σ = 1257367399800. Its totient is φ = 1173542906424.

The previous prime is 1215455153089. The next prime is 1215455153123. The reversal of 1215455153111 is 1113515545121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215455153111 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 (1215455153161) 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, 20956123301 + ... + 20956123358.

It is an arithmetic number, because the mean of its divisors is an integer number (314341849950).

Almost surely, 2^{1215455153111} is an apocalyptic number.

1215455153111 is a deficient number, since it is larger than the sum of its proper divisors (41912246689).

1215455153111 is an equidigital number, since it uses as much as digits as its factorization.

1215455153111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41912246688.

The product of its digits is 15000, while the sum is 35.

The spelling of 1215455153111 in words is "one trillion, two hundred fifteen billion, four hundred fifty-five million, one hundred fifty-three thousand, one hundred eleven".