636749401426 has 16 divisors (see below), whose sum is σ = 956898360000. Its totient is φ = 317783610928.

The previous prime is 636749401423. The next prime is 636749401439. The reversal of 636749401426 is 624104947636.

It is not an unprimeable number, because it can be changed into a prime (636749401423) 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, 3872136 + ... + 4033228.

It is an arithmetic number, because the mean of its divisors is an integer number (59806147500).

Almost surely, 2^636749401426 is an apocalyptic number.

636749401426 is a deficient number, since it is larger than the sum of its proper divisors (320148958574).

636749401426 is a wasteful number, since it uses less digits than its factorization.

636749401426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164753.

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 636749401426 in words is "six hundred thirty-six billion, seven hundred forty-nine million, four hundred one thousand, four hundred twenty-six".