636426990123 has 8 divisors (see below), whose sum is σ = 885463638528. Its totient is φ = 405837500904.

The previous prime is 636426990119. The next prime is 636426990191. The reversal of 636426990123 is 321099624636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636426990123 - 2² = 636426990119 is a prime.

It is a super-3 number, since 3×636426990123³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (636426990103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4611789715 + ... + 4611789852.

It is an arithmetic number, because the mean of its divisors is an integer number (110682954816).

Almost surely, 2^636426990123 is an apocalyptic number.

636426990123 is a deficient number, since it is larger than the sum of its proper divisors (249036648405).

636426990123 is a wasteful number, since it uses less digits than its factorization.

636426990123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9223579593.

The product of its (nonzero) digits is 2519424, while the sum is 51.

The spelling of 636426990123 in words is "six hundred thirty-six billion, four hundred twenty-six million, nine hundred ninety thousand, one hundred twenty-three".