6489748387961 has 2 divisors, whose sum is σ = 6489748387962. Its totient is φ = 6489748387960.

The previous prime is 6489748387949. The next prime is 6489748388051. The reversal of 6489748387961 is 1697838479846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6001426947961 + 488321440000 = 2449781^2 + 698800^2 .

It is a cyclic number.

It is not a de Polignac number, because 6489748387961 - 2²² = 6489744193657 is a prime.

It is not a weakly prime, because it can be changed into another prime (6489748387931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3244874193980 + 3244874193981.

It is an arithmetic number, because the mean of its divisors is an integer number (3244874193981).

Almost surely, 2^{6489748387961} is an apocalyptic number.

It is an amenable number.

6489748387961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6489748387961 is an equidigital number, since it uses as much as digits as its factorization.

6489748387961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3511517184, while the sum is 80.

The spelling of 6489748387961 in words is "six trillion, four hundred eighty-nine billion, seven hundred forty-eight million, three hundred eighty-seven thousand, nine hundred sixty-one".