61212671999 has 2 divisors, whose sum is σ = 61212672000. Its totient is φ = 61212671998.

The previous prime is 61212671981. The next prime is 61212672043. The reversal of 61212671999 is 99917621216.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61212671999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61212671999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61212671899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606335999 + 30606336000.

It is an arithmetic number, because the mean of its divisors is an integer number (30606336000).

Almost surely, 2^61212671999 is an apocalyptic number.

61212671999 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212671999 is an equidigital number, since it uses as much as digits as its factorization.

61212671999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The spelling of 61212671999 in words is "sixty-one billion, two hundred twelve million, six hundred seventy-one thousand, nine hundred ninety-nine".