198540961157 has 8 divisors (see below), whose sum is σ = 247531588032. Its totient is φ = 154707242400.

The previous prime is 198540961153. The next prime is 198540961193. The reversal of 198540961157 is 751169045891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198540961157 - 2² = 198540961153 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 (198540961153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289226944 + ... + 1289227097.

It is an arithmetic number, because the mean of its divisors is an integer number (30941448504).

Almost surely, 2^198540961157 is an apocalyptic number.

It is an amenable number.

198540961157 is a deficient number, since it is larger than the sum of its proper divisors (48990626875).

198540961157 is a wasteful number, since it uses less digits than its factorization.

198540961157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578454059.

The product of its (nonzero) digits is 2721600, while the sum is 56.

The spelling of 198540961157 in words is "one hundred ninety-eight billion, five hundred forty million, nine hundred sixty-one thousand, one hundred fifty-seven".