1370561661818 has 4 divisors (see below), whose sum is σ = 2055842492730. Its totient is φ = 685280830908.

The previous prime is 1370561661809. The next prime is 1370561661851. The reversal of 1370561661818 is 8181661650731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1048274965609 + 322286696209 = 1023853^2 + 567703^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1370561661818.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342640415453 + ... + 342640415456.

Almost surely, 2^{1370561661818} is an apocalyptic number.

1370561661818 is a deficient number, since it is larger than the sum of its proper divisors (685280830912).

1370561661818 is an equidigital number, since it uses as much as digits as its factorization.

1370561661818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685280830911.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 1370561661818 in words is "one trillion, three hundred seventy billion, five hundred sixty-one million, six hundred sixty-one thousand, eight hundred eighteen".