1577515140991 has 2 divisors, whose sum is σ = 1577515140992. Its totient is φ = 1577515140990.

The previous prime is 1577515140979. The next prime is 1577515140997. The reversal of 1577515140991 is 1990415157751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1577515140991 - 2⁵ = 1577515140959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1577515140997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 788757570495 + 788757570496.

It is an arithmetic number, because the mean of its divisors is an integer number (788757570496).

Almost surely, 2^{1577515140991} is an apocalyptic number.

1577515140991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1577515140991 is an equidigital number, since it uses as much as digits as its factorization.

1577515140991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1984500, while the sum is 55.

The spelling of 1577515140991 in words is "one trillion, five hundred seventy-seven billion, five hundred fifteen million, one hundred forty thousand, nine hundred ninety-one".