1540066627991 has 2 divisors, whose sum is σ = 1540066627992. Its totient is φ = 1540066627990.

The previous prime is 1540066627973. The next prime is 1540066627993. The reversal of 1540066627991 is 1997266600451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1540066627991 - 2³⁸ = 1265188721047 is a prime.

Together with 1540066627993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540066627993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770033313995 + 770033313996.

It is an arithmetic number, because the mean of its divisors is an integer number (770033313996).

Almost surely, 2^{1540066627991} is an apocalyptic number.

1540066627991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540066627991 is an equidigital number, since it uses as much as digits as its factorization.

1540066627991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 1540066627991 in words is "one trillion, five hundred forty billion, sixty-six million, six hundred twenty-seven thousand, nine hundred ninety-one".