2399357820181 has 16 divisors (see below), whose sum is σ = 2767534323840. Its totient is φ = 2037584989440.

The previous prime is 2399357820173. The next prime is 2399357820217. The reversal of 2399357820181 is 1810287539932.

It is a happy number.

It is not a de Polignac number, because 2399357820181 - 2³ = 2399357820173 is a prime.

It is a super-2 number, since 2×2399357820181² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399357820481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1554576 + ... + 2686153.

It is an arithmetic number, because the mean of its divisors is an integer number (172970895240).

Almost surely, 2^{2399357820181} is an apocalyptic number.

It is an amenable number.

2399357820181 is a deficient number, since it is larger than the sum of its proper divisors (368176503659).

2399357820181 is a wasteful number, since it uses less digits than its factorization.

2399357820181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241484.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 2399357820181 in words is "two trillion, three hundred ninety-nine billion, three hundred fifty-seven million, eight hundred twenty thousand, one hundred eighty-one".