1615668645 has 16 divisors (see below), whose sum is σ = 2592401472. Its totient is φ = 859246080.

The previous prime is 1615668617. The next prime is 1615668679. The reversal of 1615668645 is 5468665161.

It is not a de Polignac number, because 1615668645 - 2⁹ = 1615668133 is a prime.

It is a super-2 number, since 2×1615668645² = 5220770340872272050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1615668594 and 1615668603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147271 + ... + 157860.

It is an arithmetic number, because the mean of its divisors is an integer number (162025092).

Almost surely, 2^1615668645 is an apocalyptic number.

1615668645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1615668645 is a deficient number, since it is larger than the sum of its proper divisors (976732827).

1615668645 is a wasteful number, since it uses less digits than its factorization.

1615668645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305492.

The product of its digits is 1036800, while the sum is 48.

The square root of 1615668645 is about 40195.3808913412. The cubic root of 1615668645 is about 1173.4126493727.

The spelling of 1615668645 in words is "one billion, six hundred fifteen million, six hundred sixty-eight thousand, six hundred forty-five".