1663726424251 has 2 divisors, whose sum is σ = 1663726424252. Its totient is φ = 1663726424250.

The previous prime is 1663726424219. The next prime is 1663726424263. The reversal of 1663726424251 is 1524246273661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1663726424251 - 2⁵ = 1663726424219 is a prime.

It is a super-2 number, since 2×1663726424251² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1663726424195 and 1663726424204.

It is not a weakly prime, because it can be changed into another prime (1663726424351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831863212125 + 831863212126.

It is an arithmetic number, because the mean of its divisors is an integer number (831863212126).

Almost surely, 2^{1663726424251} is an apocalyptic number.

1663726424251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663726424251 is an equidigital number, since it uses as much as digits as its factorization.

1663726424251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 49.

The spelling of 1663726424251 in words is "one trillion, six hundred sixty-three billion, seven hundred twenty-six million, four hundred twenty-four thousand, two hundred fifty-one".