1616889553 has 2 divisors, whose sum is σ = 1616889554. Its totient is φ = 1616889552.

The previous prime is 1616889509. The next prime is 1616889613. The reversal of 1616889553 is 3559886161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1434288384 + 182601169 = 37872^2 + 13513^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616889553 - 2²¹ = 1614792401 is a prime.

It is a super-2 number, since 2×1616889553² = 5228663653201079618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616889553.

It is not a weakly prime, because it can be changed into another prime (1616809553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808444776 + 808444777.

It is an arithmetic number, because the mean of its divisors is an integer number (808444777).

Almost surely, 2^1616889553 is an apocalyptic number.

It is an amenable number.

1616889553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616889553 is an equidigital number, since it uses as much as digits as its factorization.

1616889553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 52.

The square root of 1616889553 is about 40210.5651912529. The cubic root of 1616889553 is about 1173.7081448183.

The spelling of 1616889553 in words is "one billion, six hundred sixteen million, eight hundred eighty-nine thousand, five hundred fifty-three".