1620358782418 has 4 divisors (see below), whose sum is σ = 2430538173630. Its totient is φ = 810179391208.

The previous prime is 1620358782407. The next prime is 1620358782421. The reversal of 1620358782418 is 8142878530261.

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., 895754352249 + 724604430169 = 946443^2 + 851237^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405089695603 + ... + 405089695606.

Almost surely, 2^{1620358782418} is an apocalyptic number.

1620358782418 is a deficient number, since it is larger than the sum of its proper divisors (810179391212).

1620358782418 is an equidigital number, since it uses as much as digits as its factorization.

1620358782418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810179391211.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 1620358782418 in words is "one trillion, six hundred twenty billion, three hundred fifty-eight million, seven hundred eighty-two thousand, four hundred eighteen".