616121720145 has 24 divisors (see below), whose sum is σ = 1124151912000. Its totient is φ = 311303605536.

The previous prime is 616121720117. The next prime is 616121720147. The reversal of 616121720145 is 541027121616.

616121720145 is a `hidden beast` number, since 6 + 1 + 612 + 1 + 7 + 20 + 14 + 5 = 666.

It is not a de Polignac number, because 616121720145 - 2⁵ = 616121720113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (616121720147) 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, 360304245 + ... + 360305954.

It is an arithmetic number, because the mean of its divisors is an integer number (46839663000).

Almost surely, 2^616121720145 is an apocalyptic number.

It is an amenable number.

616121720145 is a deficient number, since it is larger than the sum of its proper divisors (508030191855).

616121720145 is a wasteful number, since it uses less digits than its factorization.

616121720145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720610229 (or 720610226 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 616121720145 in words is "six hundred sixteen billion, one hundred twenty-one million, seven hundred twenty thousand, one hundred forty-five".