1618731604729 has 2 divisors, whose sum is σ = 1618731604730. Its totient is φ = 1618731604728.

The previous prime is 1618731604667. The next prime is 1618731604753. The reversal of 1618731604729 is 9274061378161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1531146386025 + 87585218704 = 1237395^2 + 295948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618731604729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1618731604729.

It is not a weakly prime, because it can be changed into another prime (1618731602729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809365802364 + 809365802365.

It is an arithmetic number, because the mean of its divisors is an integer number (809365802365).

Almost surely, 2^{1618731604729} is an apocalyptic number.

It is an amenable number.

1618731604729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618731604729 is an equidigital number, since it uses as much as digits as its factorization.

1618731604729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 1618731604729 in words is "one trillion, six hundred eighteen billion, seven hundred thirty-one million, six hundred four thousand, seven hundred twenty-nine".