198145757 has 4 divisors (see below), whose sum is σ = 198176160. Its totient is φ = 198115356.

The previous prime is 198145741. The next prime is 198145771. The reversal of 198145757 is 757541891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 757541891 = 647 ⋅1170853.

It is a cyclic number.

It is not a de Polignac number, because 198145757 - 2⁴ = 198145741 is a prime.

It is a super-3 number, since 3×198145757³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198145657) 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, 1007 + ... + 19932.

It is an arithmetic number, because the mean of its divisors is an integer number (49544040).

Almost surely, 2^198145757 is an apocalyptic number.

It is an amenable number.

198145757 is a deficient number, since it is larger than the sum of its proper divisors (30403).

198145757 is an equidigital number, since it uses as much as digits as its factorization.

198145757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30402.

The product of its digits is 352800, while the sum is 47.

The square root of 198145757 is about 14076.4255761184. The cubic root of 198145757 is about 582.9906536617.

The spelling of 198145757 in words is "one hundred ninety-eight million, one hundred forty-five thousand, seven hundred fifty-seven".