2145908571647 has 2 divisors, whose sum is σ = 2145908571648. Its totient is φ = 2145908571646.

The previous prime is 2145908571637. The next prime is 2145908571721. The reversal of 2145908571647 is 7461758095412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145908571647 is a prime.

It is a super-3 number, since 3×2145908571647³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145908571637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072954285823 + 1072954285824.

It is an arithmetic number, because the mean of its divisors is an integer number (1072954285824).

Almost surely, 2^{2145908571647} is an apocalyptic number.

2145908571647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145908571647 is an equidigital number, since it uses as much as digits as its factorization.

2145908571647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 2145908571647 in words is "two trillion, one hundred forty-five billion, nine hundred eight million, five hundred seventy-one thousand, six hundred forty-seven".