1299453607657 has 2 divisors, whose sum is σ = 1299453607658. Its totient is φ = 1299453607656.

The previous prime is 1299453607649. The next prime is 1299453607693. The reversal of 1299453607657 is 7567063549921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1206352952281 + 93100655376 = 1098341^2 + 305124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299453607657 - 2³ = 1299453607649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1299453607607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649726803828 + 649726803829.

It is an arithmetic number, because the mean of its divisors is an integer number (649726803829).

Almost surely, 2^{1299453607657} is an apocalyptic number.

It is an amenable number.

1299453607657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299453607657 is an equidigital number, since it uses as much as digits as its factorization.

1299453607657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85730400, while the sum is 64.

The spelling of 1299453607657 in words is "one trillion, two hundred ninety-nine billion, four hundred fifty-three million, six hundred seven thousand, six hundred fifty-seven".