1198631323657 has 4 divisors (see below), whose sum is σ = 1269139048596. Its totient is φ = 1128123598720.

The previous prime is 1198631323633. The next prime is 1198631323663. The reversal of 1198631323657 is 7563231368911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 796384899216 + 402246424441 = 892404^2 + 634229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1198631323657 - 2⁷ = 1198631323529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1198631323598 and 1198631323607.

It is not an unprimeable number, because it can be changed into a prime (1198631323157) 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 in 3 ways as a sum of consecutive naturals, for example, 35253862444 + ... + 35253862477.

It is an arithmetic number, because the mean of its divisors is an integer number (317284762149).

Almost surely, 2^{1198631323657} is an apocalyptic number.

1198631323657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1198631323657 is a deficient number, since it is larger than the sum of its proper divisors (70507724939).

1198631323657 is an equidigital number, since it uses as much as digits as its factorization.

1198631323657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70507724938.

The product of its digits is 4898880, while the sum is 55.

The spelling of 1198631323657 in words is "one trillion, one hundred ninety-eight billion, six hundred thirty-one million, three hundred twenty-three thousand, six hundred fifty-seven".