212299609655 has 96 divisors (see below), whose sum is σ = 318634560000. Its totient is φ = 135089095680.

The previous prime is 212299609651. The next prime is 212299609703. The reversal of 212299609655 is 556906992212.

It is not a de Polignac number, because 212299609655 - 2² = 212299609651 is a prime.

It is a super-2 number, since 2×212299609655² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212299609655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212299609651) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 32814761 + ... + 32821229.

It is an arithmetic number, because the mean of its divisors is an integer number (3319110000).

Almost surely, 2^212299609655 is an apocalyptic number.

212299609655 is a deficient number, since it is larger than the sum of its proper divisors (106334950345).

212299609655 is a wasteful number, since it uses less digits than its factorization.

212299609655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697 (or 6690 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 56.

The spelling of 212299609655 in words is "two hundred twelve billion, two hundred ninety-nine million, six hundred nine thousand, six hundred fifty-five".