126640815660 has 480 divisors, whose sum is σ = 424261297152. Its totient is φ = 31685955840.

The previous prime is 126640815659. The next prime is 126640815671. The reversal of 126640815660 is 66518046621.

126640815660 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 4 + 0 + 81 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 642846682 + ... + 642846878.

Almost surely, 2^126640815660 is an apocalyptic number.

126640815660 is a gapful number since it is divisible by the number (10) 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 126640815660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212130648576).

126640815660 is an abundant number, since it is smaller than the sum of its proper divisors (297620481492).

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

126640815660 is an equidigital number, since it uses as much as digits as its factorization.

126640815660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 126640815660 in words is "one hundred twenty-six billion, six hundred forty million, eight hundred fifteen thousand, six hundred sixty".