1615506056009 has 2 divisors, whose sum is σ = 1615506056010. Its totient is φ = 1615506056008.

The previous prime is 1615506055987. The next prime is 1615506056027. The reversal of 1615506056009 is 9006506055161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1462309747600 + 153196308409 = 1209260^2 + 391403^2 .

It is a cyclic number.

It is not a de Polignac number, because 1615506056009 - 2⁸ = 1615506055753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1615506056039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 807753028004 + 807753028005.

It is an arithmetic number, because the mean of its divisors is an integer number (807753028005).

Almost surely, 2^{1615506056009} is an apocalyptic number.

It is an amenable number.

1615506056009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1615506056009 is an equidigital number, since it uses as much as digits as its factorization.

1615506056009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 1615506056009 in words is "one trillion, six hundred fifteen billion, five hundred six million, fifty-six thousand, nine".