5128619661 has 24 divisors (see below), whose sum is σ = 8083764000. Its totient is φ = 3107368800.

The previous prime is 5128619647. The next prime is 5128619681. The reversal of 5128619661 is 1669168215.

5128619661 is a `hidden beast` number, since 5 + 1 + 28 + 619 + 6 + 6 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-5128619661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5128619681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564646 + ... + 573656.

It is an arithmetic number, because the mean of its divisors is an integer number (336823500).

Almost surely, 2^5128619661 is an apocalyptic number.

It is an amenable number.

5128619661 is a deficient number, since it is larger than the sum of its proper divisors (2955144339).

5128619661 is a wasteful number, since it uses less digits than its factorization.

5128619661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14777 (or 14774 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 5128619661 is about 71614.3816631827. The cubic root of 5128619661 is about 1724.5144231243.

The spelling of 5128619661 in words is "five billion, one hundred twenty-eight million, six hundred nineteen thousand, six hundred sixty-one".