1948403346991 has 2 divisors, whose sum is σ = 1948403346992. Its totient is φ = 1948403346990.

The previous prime is 1948403346959. The next prime is 1948403347067. The reversal of 1948403346991 is 1996433048491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1948403346991 - 2⁵ = 1948403346959 is a prime.

It is a super-2 number, since 2×1948403346991² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1948403346941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974201673495 + 974201673496.

It is an arithmetic number, because the mean of its divisors is an integer number (974201673496).

Almost surely, 2^{1948403346991} is an apocalyptic number.

1948403346991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948403346991 is an equidigital number, since it uses as much as digits as its factorization.

1948403346991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 1948403346991 in words is "one trillion, nine hundred forty-eight billion, four hundred three million, three hundred forty-six thousand, nine hundred ninety-one".