195720029505 has 384 divisors, whose sum is σ = 464258995200. Its totient is φ = 74268057600.

The previous prime is 195720029497. The next prime is 195720029539. The reversal of 195720029505 is 505920027591.

195720029505 is a `hidden beast` number, since 1 + 9 + 572 + 0 + 0 + 29 + 50 + 5 = 666.

It is not a de Polignac number, because 195720029505 - 2³ = 195720029497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 812116185 + ... + 812116425.

It is an arithmetic number, because the mean of its divisors is an integer number (1209007800).

Almost surely, 2^195720029505 is an apocalyptic number.

195720029505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

195720029505 is an abundant number, since it is smaller than the sum of its proper divisors (268538965695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

195720029505 is a wasteful number, since it uses less digits than its factorization.

195720029505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 45.

The spelling of 195720029505 in words is "one hundred ninety-five billion, seven hundred twenty million, twenty-nine thousand, five hundred five".