616139725 has 24 divisors (see below), whose sum is σ = 810011648. Its totient is φ = 464097600.

The previous prime is 616139683. The next prime is 616139729. The reversal of 616139725 is 527931616.

It is not a de Polignac number, because 616139725 - 2⁹ = 616139213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616139729) 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, 17932 + ... + 39418.

Almost surely, 2^616139725 is an apocalyptic number.

It is an amenable number.

616139725 is a deficient number, since it is larger than the sum of its proper divisors (193871923).

616139725 is a wasteful number, since it uses less digits than its factorization.

616139725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21565 (or 21560 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 616139725 is about 24822.1619727211. The cubic root of 616139725 is about 850.9285009498.

The spelling of 616139725 in words is "six hundred sixteen million, one hundred thirty-nine thousand, seven hundred twenty-five".