646432265146649 has 2 divisors, whose sum is σ = 646432265146650. Its totient is φ = 646432265146648.

The previous prime is 646432265146541. The next prime is 646432265146687. The reversal of 646432265146649 is 946641562234646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633170781523225 + 13261483623424 = 25162885^2 + 3641632^2 .

It is a cyclic number.

It is not a de Polignac number, because 646432265146649 - 2²⁴ = 646432248369433 is a prime.

It is not a weakly prime, because it can be changed into another prime (646432265146699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323216132573324 + 323216132573325.

It is an arithmetic number, because the mean of its divisors is an integer number (323216132573325).

Almost surely, 2^{646432265146649} is an apocalyptic number.

It is an amenable number.

646432265146649 is a deficient number, since it is larger than the sum of its proper divisors (1).

646432265146649 is an equidigital number, since it uses as much as digits as its factorization.

646432265146649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1074954240, while the sum is 68.

The spelling of 646432265146649 in words is "six hundred forty-six trillion, four hundred thirty-two billion, two hundred sixty-five million, one hundred forty-six thousand, six hundred forty-nine".