61403978620211 has 2 divisors, whose sum is σ = 61403978620212. Its totient is φ = 61403978620210.

The previous prime is 61403978620147. The next prime is 61403978620241. The reversal of 61403978620211 is 11202687930416.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61403978620211 - 2⁶ = 61403978620147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61403978620211.

It is not a weakly prime, because it can be changed into another prime (61403978620241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30701989310105 + 30701989310106.

It is an arithmetic number, because the mean of its divisors is an integer number (30701989310106).

Almost surely, 2^{61403978620211} is an apocalyptic number.

61403978620211 is a deficient number, since it is larger than the sum of its proper divisors (1).

61403978620211 is an equidigital number, since it uses as much as digits as its factorization.

61403978620211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 61403978620211 in words is "sixty-one trillion, four hundred three billion, nine hundred seventy-eight million, six hundred twenty thousand, two hundred eleven".