1640991057127 has 2 divisors, whose sum is σ = 1640991057128. Its totient is φ = 1640991057126.

The previous prime is 1640991057107. The next prime is 1640991057151. The reversal of 1640991057127 is 7217501990461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640991057127 - 2²³ = 1640982668519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640991057107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820495528563 + 820495528564.

It is an arithmetic number, because the mean of its divisors is an integer number (820495528564).

Almost surely, 2^{1640991057127} is an apocalyptic number.

1640991057127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640991057127 is an equidigital number, since it uses as much as digits as its factorization.

1640991057127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 1640991057127 in words is "one trillion, six hundred forty billion, nine hundred ninety-one million, fifty-seven thousand, one hundred twenty-seven".