634322661401 has 24 divisors (see below), whose sum is σ = 753499337760. Its totient is φ = 529324723200.

The previous prime is 634322661397. The next prime is 634322661421. The reversal of 634322661401 is 104166223436.

It is not a de Polignac number, because 634322661401 - 2² = 634322661397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634322661421) 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 23 ways as a sum of consecutive naturals, for example, 620360 + ... + 1285881.

It is an arithmetic number, because the mean of its divisors is an integer number (31395805740).

Almost surely, 2^634322661401 is an apocalyptic number.

It is an amenable number.

634322661401 is a deficient number, since it is larger than the sum of its proper divisors (119176676359).

634322661401 is a wasteful number, since it uses less digits than its factorization.

634322661401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906457 (or 1906444 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

Adding to 634322661401 its reverse (104166223436), we get a palindrome (738488884837).

The spelling of 634322661401 in words is "six hundred thirty-four billion, three hundred twenty-two million, six hundred sixty-one thousand, four hundred one".