126212203661 has 8 divisors (see below), whose sum is σ = 129198710784. Its totient is φ = 123228030240.

The previous prime is 126212203651. The next prime is 126212203727. The reversal of 126212203661 is 166302212621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126212203661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126212203651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473741 + ... + 690546.

It is an arithmetic number, because the mean of its divisors is an integer number (16149838848).

Almost surely, 2^126212203661 is an apocalyptic number.

It is an amenable number.

126212203661 is a deficient number, since it is larger than the sum of its proper divisors (2986507123).

126212203661 is a wasteful number, since it uses less digits than its factorization.

126212203661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166851.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 126212203661 in words is "one hundred twenty-six billion, two hundred twelve million, two hundred three thousand, six hundred sixty-one".