42451199993 has 2 divisors, whose sum is σ = 42451199994. Its totient is φ = 42451199992.

The previous prime is 42451199963. The next prime is 42451200017. The reversal of 42451199993 is 39999115424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31059480169 + 11391719824 = 176237^2 + 106732^2 .

It is a cyclic number.

It is not a de Polignac number, because 42451199993 - 2⁶ = 42451199929 is a prime.

It is not a weakly prime, because it can be changed into another prime (42451199963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225599996 + 21225599997.

It is an arithmetic number, because the mean of its divisors is an integer number (21225599997).

Almost surely, 2^42451199993 is an apocalyptic number.

It is an amenable number.

42451199993 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451199993 is an equidigital number, since it uses as much as digits as its factorization.

42451199993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3149280, while the sum is 56.

The spelling of 42451199993 in words is "forty-two billion, four hundred fifty-one million, one hundred ninety-nine thousand, nine hundred ninety-three".