1680581156 has 6 divisors (see below), whose sum is σ = 2941017030. Its totient is φ = 840290576.

The previous prime is 1680581153. The next prime is 1680581159. The reversal of 1680581156 is 6511850861.

It is an interprime number because it is at equal distance from previous prime (1680581153) and next prime (1680581159).

It can be written as a sum of positive squares in only one way, i.e., 1222621156 + 457960000 = 34966^2 + 21400^2 .

It is a super-3 number, since 3×1680581156³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1680581153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210072641 + ... + 210072648.

It is an arithmetic number, because the mean of its divisors is an integer number (490169505).

Almost surely, 2^1680581156 is an apocalyptic number.

It is an amenable number.

1680581156 is a deficient number, since it is larger than the sum of its proper divisors (1260435874).

1680581156 is a wasteful number, since it uses less digits than its factorization.

1680581156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420145293 (or 420145291 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 41.

The square root of 1680581156 is about 40994.8918281290. The cubic root of 1680581156 is about 1188.9214519680.

The spelling of 1680581156 in words is "one billion, six hundred eighty million, five hundred eighty-one thousand, one hundred fifty-six".