1551948537193 has 2 divisors, whose sum is σ = 1551948537194. Its totient is φ = 1551948537192.

The previous prime is 1551948537179. The next prime is 1551948537277. The reversal of 1551948537193 is 3917358491551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1532030013504 + 19918523689 = 1237752^2 + 141133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551948537193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551948537103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775974268596 + 775974268597.

It is an arithmetic number, because the mean of its divisors is an integer number (775974268597).

Almost surely, 2^{1551948537193} is an apocalyptic number.

It is an amenable number.

1551948537193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551948537193 is an equidigital number, since it uses as much as digits as its factorization.

1551948537193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412000, while the sum is 61.

The spelling of 1551948537193 in words is "one trillion, five hundred fifty-one billion, nine hundred forty-eight million, five hundred thirty-seven thousand, one hundred ninety-three".