155198243897 has 4 divisors (see below), whose sum is σ = 155317353600. Its totient is φ = 155079134196.

The previous prime is 155198243891. The next prime is 155198243903. The reversal of 155198243897 is 798342891551.

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 an interprime number because it is at equal distance from previous prime (155198243891) and next prime (155198243903).

It is a cyclic number.

It is not a de Polignac number, because 155198243897 - 2¹⁰ = 155198242873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155198243891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59552897 + ... + 59555502.

It is an arithmetic number, because the mean of its divisors is an integer number (38829338400).

Almost surely, 2^155198243897 is an apocalyptic number.

It is an amenable number.

155198243897 is a deficient number, since it is larger than the sum of its proper divisors (119109703).

155198243897 is a wasteful number, since it uses less digits than its factorization.

155198243897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119109702.

The product of its digits is 21772800, while the sum is 62.

The spelling of 155198243897 in words is "one hundred fifty-five billion, one hundred ninety-eight million, two hundred forty-three thousand, eight hundred ninety-seven".