1975564395667 has 2 divisors, whose sum is σ = 1975564395668. Its totient is φ = 1975564395666.

The previous prime is 1975564395583. The next prime is 1975564395691. The reversal of 1975564395667 is 7665934655791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1975564395667 - 2²³ = 1975556007059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1975564395667.

It is not a weakly prime, because it can be changed into another prime (1975564395067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987782197833 + 987782197834.

It is an arithmetic number, because the mean of its divisors is an integer number (987782197834).

Almost surely, 2^{1975564395667} is an apocalyptic number.

1975564395667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975564395667 is an equidigital number, since it uses as much as digits as its factorization.

1975564395667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1285956000, while the sum is 73.

The spelling of 1975564395667 in words is "one trillion, nine hundred seventy-five billion, five hundred sixty-four million, three hundred ninety-five thousand, six hundred sixty-seven".