1616615620 has 12 divisors (see below), whose sum is σ = 3394892844. Its totient is φ = 646646240.

The previous prime is 1616615603. The next prime is 1616615647. The reversal of 1616615620 is 265166161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 458302464 + 1158313156 = 21408^2 + 34034^2 .

It is a super-2 number, since 2×1616615620² = 5226892125655968800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40415371 + ... + 40415410.

It is an arithmetic number, because the mean of its divisors is an integer number (282907737).

Almost surely, 2^1616615620 is an apocalyptic number.

1616615620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616615620 is an abundant number, since it is smaller than the sum of its proper divisors (1778277224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1616615620 is a wasteful number, since it uses less digits than its factorization.

1616615620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80830790 (or 80830788 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1616615620 is about 40207.1588153155. The cubic root of 1616615620 is about 1173.6418579670.

It can be divided in two parts, 161661 and 5620, that added together give a square (167281 = 409²).

The spelling of 1616615620 in words is "one billion, six hundred sixteen million, six hundred fifteen thousand, six hundred twenty".