126665402052 has 96 divisors (see below), whose sum is σ = 356092871680. Its totient is φ = 34233217920.

The previous prime is 126665401997. The next prime is 126665402057. The reversal of 126665402052 is 250204566621.

It is a self number, because there is not a number n which added to its sum of digits gives 126665402052.

It is not an unprimeable number, because it can be changed into a prime (126665402057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 994923 + ... + 1114989.

Almost surely, 2^126665402052 is an apocalyptic number.

126665402052 is a gapful number since it is divisible by the number (12) 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 126665402052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178046435840).

126665402052 is an abundant number, since it is smaller than the sum of its proper divisors (229427469628).

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

126665402052 is a wasteful number, since it uses less digits than its factorization.

126665402052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120761 (or 120759 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 126665402052 its reverse (250204566621), we get a palindrome (376869968673).

The spelling of 126665402052 in words is "one hundred twenty-six billion, six hundred sixty-five million, four hundred two thousand, fifty-two".