1618297666624 has 42 divisors (see below), whose sum is σ = 3236796499470. Its totient is φ = 802777070592.

The previous prime is 1618297666591. The next prime is 1618297666669. The reversal of 1618297666624 is 4266667928161.

It can be written as a sum of positive squares in only one way, i.e., 1618065409024 + 232257600 = 1272032^2 + 15240^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 248392 + ... + 1816120.

Almost surely, 2^{1618297666624} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1618297666624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1618398249735).

1618297666624 is an abundant number, since it is smaller than the sum of its proper divisors (1618498832846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1618297666624 is an equidigital number, since it uses as much as digits as its factorization.

1618297666624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567995 (or 1567858 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 64.

The spelling of 1618297666624 in words is "one trillion, six hundred eighteen billion, two hundred ninety-seven million, six hundred sixty-six thousand, six hundred twenty-four".