1616681840 has 20 divisors (see below), whose sum is σ = 3758785464. Its totient is φ = 646672704.

The previous prime is 1616681813. The next prime is 1616681867. The reversal of 1616681840 is 481866161.

It is an interprime number because it is at equal distance from previous prime (1616681813) and next prime (1616681867).

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1616681840² = 5227320343571571200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10104182 + ... + 10104341.

Almost surely, 2^1616681840 is an apocalyptic number.

1616681840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616681840 is an abundant number, since it is smaller than the sum of its proper divisors (2142103624).

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

1616681840 is a wasteful number, since it uses less digits than its factorization.

1616681840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20208536 (or 20208530 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1616681840 is about 40207.9822920773. The cubic root of 1616681840 is about 1173.6578827004.

The spelling of 1616681840 in words is "one billion, six hundred sixteen million, six hundred eighty-one thousand, eight hundred forty".