616615992001 has 3 divisors (see below), whose sum is σ = 616616777251. Its totient is φ = 616615206752.

The previous prime is 616615991983. The next prime is 616615992023. The reversal of 616615992001 is 100299516616.

It is a happy number.

The square root of 616615992001 is 785249.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 359039441601 + 257576550400 = 599199^2 + 507520^2 .

It is not a de Polignac number, because 616615992001 - 2⁵ = 616615991969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616615992401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 392625 + ... + 1177873.

Almost surely, 2^616615992001 is an apocalyptic number.

616615992001 is the 785249-th square number.

616615992001 is the 392625-th centered octagonal number.

It is an amenable number.

616615992001 is a deficient number, since it is larger than the sum of its proper divisors (785250).

616615992001 is an frugal number, since it uses more digits than its factorization.

616615992001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570498 (or 785249 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 616615992001 in words is "six hundred sixteen billion, six hundred fifteen million, nine hundred ninety-two thousand, one".