616561557 has 8 divisors (see below), whose sum is σ = 839573376. Its totient is φ = 402295392.

The previous prime is 616561523. The next prime is 616561579. The reversal of 616561557 is 755165616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 616561557 - 2⁶ = 616561493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616561597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2186248 + ... + 2186529.

It is an arithmetic number, because the mean of its divisors is an integer number (104946672).

Almost surely, 2^616561557 is an apocalyptic number.

It is an amenable number.

616561557 is a deficient number, since it is larger than the sum of its proper divisors (223011819).

616561557 is a wasteful number, since it uses less digits than its factorization.

616561557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372827.

The product of its digits is 189000, while the sum is 42.

The square root of 616561557 is about 24830.6576030519. The cubic root of 616561557 is about 851.1226490040.

The spelling of 616561557 in words is "six hundred sixteen million, five hundred sixty-one thousand, five hundred fifty-seven".