2015355015491 has 2 divisors, whose sum is σ = 2015355015492. Its totient is φ = 2015355015490.

The previous prime is 2015355015329. The next prime is 2015355015523. The reversal of 2015355015491 is 1945105535102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2015355015491 - 2³⁸ = 1740477108547 is a prime.

It is not a weakly prime, because it can be changed into another prime (2015355011491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007677507745 + 1007677507746.

It is an arithmetic number, because the mean of its divisors is an integer number (1007677507746).

Almost surely, 2^{2015355015491} is an apocalyptic number.

2015355015491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015355015491 is an equidigital number, since it uses as much as digits as its factorization.

2015355015491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 2015355015491 in words is "two trillion, fifteen billion, three hundred fifty-five million, fifteen thousand, four hundred ninety-one".