1616591663009 has 2 divisors, whose sum is σ = 1616591663010. Its totient is φ = 1616591663008.

The previous prime is 1616591662999. The next prime is 1616591663077. The reversal of 1616591663009 is 9003661956161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1047494934784 + 569096728225 = 1023472^2 + 754385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616591663009 - 2⁸ = 1616591662753 is a prime.

It is a super-2 number, since 2×1616591663009² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616591663209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808295831504 + 808295831505.

It is an arithmetic number, because the mean of its divisors is an integer number (808295831505).

Almost surely, 2^{1616591663009} is an apocalyptic number.

It is an amenable number.

1616591663009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616591663009 is an equidigital number, since it uses as much as digits as its factorization.

1616591663009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 1616591663009 in words is "one trillion, six hundred sixteen billion, five hundred ninety-one million, six hundred sixty-three thousand, nine".