1681612799 has 2 divisors, whose sum is σ = 1681612800. Its totient is φ = 1681612798.

The previous prime is 1681612787. The next prime is 1681612837. The reversal of 1681612799 is 9972161861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681612799 - 2²⁴ = 1664835583 is a prime.

It is a super-2 number, since 2×1681612799² = 5655643211521228802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681642799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840806399 + 840806400.

It is an arithmetic number, because the mean of its divisors is an integer number (840806400).

Almost surely, 2^1681612799 is an apocalyptic number.

1681612799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681612799 is an equidigital number, since it uses as much as digits as its factorization.

1681612799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 50.

The square root of 1681612799 is about 41007.4724775863. The cubic root of 1681612799 is about 1189.1646796552.

The spelling of 1681612799 in words is "one billion, six hundred eighty-one million, six hundred twelve thousand, seven hundred ninety-nine".