634587988901 has 4 divisors (see below), whose sum is σ = 649345849152. Its totient is φ = 619830128652.

The previous prime is 634587988889. The next prime is 634587989003. The reversal of 634587988901 is 109889785436.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 634587988901 - 2³⁸ = 359710081957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634587088901) 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, 7378930061 + ... + 7378930146.

It is an arithmetic number, because the mean of its divisors is an integer number (162336462288).

Almost surely, 2^634587988901 is an apocalyptic number.

It is an amenable number.

634587988901 is a deficient number, since it is larger than the sum of its proper divisors (14757860251).

634587988901 is a wasteful number, since it uses less digits than its factorization.

634587988901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14757860250.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 634587988901 in words is "six hundred thirty-four billion, five hundred eighty-seven million, nine hundred eighty-eight thousand, nine hundred one".