1618681497793 has 8 divisors (see below), whose sum is σ = 1662456882920. Its totient is φ = 1574907546240.

The previous prime is 1618681497773. The next prime is 1618681497841. The reversal of 1618681497793 is 3977941868161.

It can be written as a sum of positive squares in 4 ways, for example, as 294552596529 + 1324128901264 = 542727^2 + 1150708^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1618681497793 - 2⁵ = 1618681497761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618681497733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2167963 + ... + 2817343.

It is an arithmetic number, because the mean of its divisors is an integer number (207807110365).

Almost surely, 2^{1618681497793} is an apocalyptic number.

It is an amenable number.

1618681497793 is a deficient number, since it is larger than the sum of its proper divisors (43775385127).

1618681497793 is an equidigital number, since it uses as much as digits as its factorization.

1618681497793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716787.

The product of its digits is 109734912, while the sum is 70.

The spelling of 1618681497793 in words is "one trillion, six hundred eighteen billion, six hundred eighty-one million, four hundred ninety-seven thousand, seven hundred ninety-three".