634121171995 has 16 divisors (see below), whose sum is σ = 775334633472. Its totient is φ = 497704904320.

The previous prime is 634121171993. The next prime is 634121172001. The reversal of 634121171995 is 599171121436.

It is not a de Polignac number, because 634121171995 - 2¹ = 634121171993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634121171993) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12116454 + ... + 12168676.

It is an arithmetic number, because the mean of its divisors is an integer number (48458414592).

Almost surely, 2^634121171995 is an apocalyptic number.

634121171995 is a deficient number, since it is larger than the sum of its proper divisors (141213461477).

634121171995 is a wasteful number, since it uses less digits than its factorization.

634121171995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98102.

The product of its digits is 408240, while the sum is 49.

The spelling of 634121171995 in words is "six hundred thirty-four billion, one hundred twenty-one million, one hundred seventy-one thousand, nine hundred ninety-five".