1681265672 has 8 divisors (see below), whose sum is σ = 3152373150. Its totient is φ = 840632832.

The previous prime is 1681265671. The next prime is 1681265693. The reversal of 1681265672 is 2765621861.

It can be written as a sum of positive squares in only one way, i.e., 1393827556 + 287438116 = 37334^2 + 16954^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×1681265672³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1681265671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105079097 + ... + 105079112.

Almost surely, 2^1681265672 is an apocalyptic number.

It is an amenable number.

1681265672 is a deficient number, since it is larger than the sum of its proper divisors (1471107478).

1681265672 is a wasteful number, since it uses less digits than its factorization.

1681265672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210158215 (or 210158211 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 1681265672 is about 41003.2397744373. The cubic root of 1681265672 is about 1189.0828495663.

The spelling of 1681265672 in words is "one billion, six hundred eighty-one million, two hundred sixty-five thousand, six hundred seventy-two".