1681333623 has 12 divisors (see below), whose sum is σ = 2429047608. Its totient is φ = 1120679280.

The previous prime is 1681333607. The next prime is 1681333657. The reversal of 1681333623 is 3263331861.

1681333623 is a `hidden beast` number, since 16 + 8 + 13 + 3 + 3 + 623 = 666.

It is not a de Polignac number, because 1681333623 - 2⁴ = 1681333607 is a prime.

It is a super-2 number, since 2×1681333623² = 5653765503660612258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681333673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45036 + ... + 73422.

It is an arithmetic number, because the mean of its divisors is an integer number (202420634).

Almost surely, 2^1681333623 is an apocalyptic number.

1681333623 is a deficient number, since it is larger than the sum of its proper divisors (747713985).

1681333623 is a wasteful number, since it uses less digits than its factorization.

1681333623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34974 (or 34971 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 1681333623 is about 41004.0683713214. The cubic root of 1681333623 is about 1189.0988689026.

The spelling of 1681333623 in words is "one billion, six hundred eighty-one million, three hundred thirty-three thousand, six hundred twenty-three".