1616928857 has 2 divisors, whose sum is σ = 1616928858. Its totient is φ = 1616928856.

The previous prime is 1616928847. The next prime is 1616928883. The reversal of 1616928857 is 7588296161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 809743936 + 807184921 = 28456^2 + 28411^2 .

It is an emirp because it is prime and its reverse (7588296161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1616928857 - 2¹⁶ = 1616863321 is a prime.

It is a super-2 number, since 2×1616928857² = 5228917857198652898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616928799 and 1616928808.

It is not a weakly prime, because it can be changed into another prime (1616928847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808464428 + 808464429.

It is an arithmetic number, because the mean of its divisors is an integer number (808464429).

Almost surely, 2^1616928857 is an apocalyptic number.

It is an amenable number.

1616928857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616928857 is an equidigital number, since it uses as much as digits as its factorization.

1616928857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 1616928857 is about 40211.0539155591. The cubic root of 1616928857 is about 1173.7176550641.

The spelling of 1616928857 in words is "one billion, six hundred sixteen million, nine hundred twenty-eight thousand, eight hundred fifty-seven".