1681951630536 has 96 divisors (see below), whose sum is σ = 4867493974200. Its totient is φ = 522830039040.

The previous prime is 1681951630531. The next prime is 1681951630559. The reversal of 1681951630536 is 6350361591861.

1681951630536 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 95 + 16 + 3 + 0 + 536 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1649411078436 + 32540552100 = 1284294^2 + 180390^2 .

It is a super-2 number, since 2×1681951630536² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681951630531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6169995 + ... + 6436826.

Almost surely, 2^{1681951630536} is an apocalyptic number.

It is an amenable number.

1681951630536 is an abundant number, since it is smaller than the sum of its proper divisors (3185542343664).

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

1681951630536 is a wasteful number, since it uses less digits than its factorization.

1681951630536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12606959 (or 12606952 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 1681951630536 in words is "one trillion, six hundred eighty-one billion, nine hundred fifty-one million, six hundred thirty thousand, five hundred thirty-six".