42172455897 has 64 divisors (see below), whose sum is σ = 76591872000. Its totient is φ = 22567152960.

The previous prime is 42172455889. The next prime is 42172455929. The reversal of 42172455897 is 79855427124.

42172455897 is a `hidden beast` number, since 4 + 2 + 17 + 2 + 45 + 589 + 7 = 666.

It is not a de Polignac number, because 42172455897 - 2³ = 42172455889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42172455827) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 148647 + ... + 326252.

It is an arithmetic number, because the mean of its divisors is an integer number (1196748000).

Almost surely, 2^42172455897 is an apocalyptic number.

It is an amenable number.

42172455897 is a deficient number, since it is larger than the sum of its proper divisors (34419416103).

42172455897 is a wasteful number, since it uses less digits than its factorization.

42172455897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474955 (or 474949 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 42172455897 in words is "forty-two billion, one hundred seventy-two million, four hundred fifty-five thousand, eight hundred ninety-seven".