6401543497 has 2 divisors, whose sum is σ = 6401543498. Its totient is φ = 6401543496.

The previous prime is 6401543459. The next prime is 6401543501. The reversal of 6401543497 is 7943451046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6376182201 + 25361296 = 79851^2 + 5036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6401543497 is a prime.

It is not a weakly prime, because it can be changed into another prime (6401543297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200771748 + 3200771749.

It is an arithmetic number, because the mean of its divisors is an integer number (3200771749).

Almost surely, 2^6401543497 is an apocalyptic number.

It is an amenable number.

6401543497 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401543497 is an equidigital number, since it uses as much as digits as its factorization.

6401543497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 6401543497 is about 80009.6462746837. The cubic root of 6401543497 is about 1856.7847772488.

The spelling of 6401543497 in words is "six billion, four hundred one million, five hundred forty-three thousand, four hundred ninety-seven".