1620968233615 has 4 divisors (see below), whose sum is σ = 1945161880344. Its totient is φ = 1296774586888.

The previous prime is 1620968233607. The next prime is 1620968233649. The reversal of 1620968233615 is 5163328690261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620968233615 - 2³ = 1620968233607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162096823357 + ... + 162096823366.

It is an arithmetic number, because the mean of its divisors is an integer number (486290470086).

Almost surely, 2^{1620968233615} is an apocalyptic number.

1620968233615 is a deficient number, since it is larger than the sum of its proper divisors (324193646729).

1620968233615 is an equidigital number, since it uses as much as digits as its factorization.

1620968233615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324193646728.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 1620968233615 in words is "one trillion, six hundred twenty billion, nine hundred sixty-eight million, two hundred thirty-three thousand, six hundred fifteen".