46399815451981 has 2 divisors, whose sum is σ = 46399815451982. Its totient is φ = 46399815451980.

The previous prime is 46399815451939. The next prime is 46399815451993. The reversal of 46399815451981 is 18915451899364.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46399815451081 + 900 = 6811741^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 46399815451981 - 2¹⁷ = 46399815320909 is a prime.

It is a super-2 number, since 2×46399815451981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (46399815451931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23199907725990 + 23199907725991.

It is an arithmetic number, because the mean of its divisors is an integer number (23199907725991).

Almost surely, 2^{46399815451981} is an apocalyptic number.

It is an amenable number.

46399815451981 is a deficient number, since it is larger than the sum of its proper divisors (1).

46399815451981 is an equidigital number, since it uses as much as digits as its factorization.

46399815451981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 335923200, while the sum is 73.

The spelling of 46399815451981 in words is "forty-six trillion, three hundred ninety-nine billion, eight hundred fifteen million, four hundred fifty-one thousand, nine hundred eighty-one".