615664648789 has 2 divisors, whose sum is σ = 615664648790. Its totient is φ = 615664648788.

The previous prime is 615664648783. The next prime is 615664648801. The reversal of 615664648789 is 987846466516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396484308900 + 219180339889 = 629670^2 + 468167^2 .

It is a cyclic number.

It is not a de Polignac number, because 615664648789 - 2⁵ = 615664648757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615664648783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307832324394 + 307832324395.

It is an arithmetic number, because the mean of its divisors is an integer number (307832324395).

Almost surely, 2^615664648789 is an apocalyptic number.

It is an amenable number.

615664648789 is a deficient number, since it is larger than the sum of its proper divisors (1).

615664648789 is an equidigital number, since it uses as much as digits as its factorization.

615664648789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 418037760, while the sum is 70.

The spelling of 615664648789 in words is "six hundred fifteen billion, six hundred sixty-four million, six hundred forty-eight thousand, seven hundred eighty-nine".