1198940156597 has 4 divisors (see below), whose sum is σ = 1199105694720. Its totient is φ = 1198774618476.

The previous prime is 1198940156591. The next prime is 1198940156653. The reversal of 1198940156597 is 7956510498911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1198940156597 - 2¹⁶ = 1198940091061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198940156591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82758197 + ... + 82772682.

It is an arithmetic number, because the mean of its divisors is an integer number (299776423680).

Almost surely, 2^{1198940156597} is an apocalyptic number.

It is an amenable number.

1198940156597 is a deficient number, since it is larger than the sum of its proper divisors (165538123).

1198940156597 is an equidigital number, since it uses as much as digits as its factorization.

1198940156597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165538122.

The product of its (nonzero) digits is 24494400, while the sum is 65.

The spelling of 1198940156597 in words is "one trillion, one hundred ninety-eight billion, nine hundred forty million, one hundred fifty-six thousand, five hundred ninety-seven".