126640199136 has 144 divisors (see below), whose sum is σ = 365718011904. Its totient is φ = 38371132800.

The previous prime is 126640199039. The next prime is 126640199183. The reversal of 126640199136 is 631991046621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15456801 + ... + 15464991.

It is an arithmetic number, because the mean of its divisors is an integer number (2539708416).

Almost surely, 2^126640199136 is an apocalyptic number.

126640199136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126640199136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182859005952).

126640199136 is an abundant number, since it is smaller than the sum of its proper divisors (239077812768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126640199136 is an frugal number, since it uses more digits than its factorization.

126640199136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8259 (or 8207 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The spelling of 126640199136 in words is "one hundred twenty-six billion, six hundred forty million, one hundred ninety-nine thousand, one hundred thirty-six".