1100015815897 has 2 divisors, whose sum is σ = 1100015815898. Its totient is φ = 1100015815896.

The previous prime is 1100015815859. The next prime is 1100015815901. The reversal of 1100015815897 is 7985185100011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1088326746441 + 11689069456 = 1043229^2 + 108116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100015815897 - 2¹⁵ = 1100015783129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1100015885897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550007907948 + 550007907949.

It is an arithmetic number, because the mean of its divisors is an integer number (550007907949).

Almost surely, 2^{1100015815897} is an apocalyptic number.

It is an amenable number.

1100015815897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100015815897 is an equidigital number, since it uses as much as digits as its factorization.

1100015815897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 46.

The spelling of 1100015815897 in words is "one trillion, one hundred billion, fifteen million, eight hundred fifteen thousand, eight hundred ninety-seven".