616405445 has 4 divisors (see below), whose sum is σ = 739686540. Its totient is φ = 493124352.

The previous prime is 616405441. The next prime is 616405481. The reversal of 616405445 is 544504616.

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

It can be written as a sum of positive squares in 2 ways, for example, as 436684609 + 179720836 = 20897^2 + 13406^2 .

It is a cyclic number.

It is not a de Polignac number, because 616405445 - 2² = 616405441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616405441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61640540 + ... + 61640549.

It is an arithmetic number, because the mean of its divisors is an integer number (184921635).

Almost surely, 2^616405445 is an apocalyptic number.

It is an amenable number.

616405445 is a deficient number, since it is larger than the sum of its proper divisors (123281095).

616405445 is a wasteful number, since it uses less digits than its factorization.

616405445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123281094.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 616405445 is about 24827.5138707040. The cubic root of 616405445 is about 851.0508088266.

The spelling of 616405445 in words is "six hundred sixteen million, four hundred five thousand, four hundred forty-five".