1670504557991 has 2 divisors, whose sum is σ = 1670504557992. Its totient is φ = 1670504557990.

The previous prime is 1670504557973. The next prime is 1670504558027. The reversal of 1670504557991 is 1997554050761.

It is a weak prime.

It is an emirp because it is prime and its reverse (1997554050761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670504557991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1670504557991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670504550991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835252278995 + 835252278996.

It is an arithmetic number, because the mean of its divisors is an integer number (835252278996).

Almost surely, 2^{1670504557991} is an apocalyptic number.

1670504557991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670504557991 is an equidigital number, since it uses as much as digits as its factorization.

1670504557991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11907000, while the sum is 59.

The spelling of 1670504557991 in words is "one trillion, six hundred seventy billion, five hundred four million, five hundred fifty-seven thousand, nine hundred ninety-one".