1378557016091 has 2 divisors, whose sum is σ = 1378557016092. Its totient is φ = 1378557016090.

The previous prime is 1378557016079. The next prime is 1378557016093. The reversal of 1378557016091 is 1906107558731.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378557016091 is a prime.

It is a super-2 number, since 2×1378557016091² (a number of 25 digits) contains 22 as substring.

Together with 1378557016093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1378557016093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689278508045 + 689278508046.

It is an arithmetic number, because the mean of its divisors is an integer number (689278508046).

Almost surely, 2^{1378557016091} is an apocalyptic number.

1378557016091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378557016091 is an equidigital number, since it uses as much as digits as its factorization.

1378557016091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 1378557016091 in words is "one trillion, three hundred seventy-eight billion, five hundred fifty-seven million, sixteen thousand, ninety-one".