616445051615 has 4 divisors (see below), whose sum is σ = 739734061944. Its totient is φ = 493156041288.

The previous prime is 616445051609. The next prime is 616445051617. The reversal of 616445051615 is 516150544616.

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 616445051615 - 2⁸ = 616445051359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616445051617) by changing a digit.

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, 61644505157 + ... + 61644505166.

It is an arithmetic number, because the mean of its divisors is an integer number (184933515486).

Almost surely, 2^616445051615 is an apocalyptic number.

616445051615 is a deficient number, since it is larger than the sum of its proper divisors (123289010329).

616445051615 is a wasteful number, since it uses less digits than its factorization.

616445051615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123289010328.

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 616445051615 in words is "six hundred sixteen billion, four hundred forty-five million, fifty-one thousand, six hundred fifteen".