61551211517211 has 32 divisors (see below), whose sum is σ = 92316514268160. Its totient is φ = 36216478537344.

The previous prime is 61551211517197. The next prime is 61551211517261. The reversal of 61551211517211 is 11271511215516.

61551211517211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61551211517211 - 2¹¹ = 61551211515163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 61551211517211.

It is not an unprimeable number, because it can be changed into a prime (61551211517261) 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 in 31 ways as a sum of consecutive naturals, for example, 264067671 + ... + 264300656.

It is an arithmetic number, because the mean of its divisors is an integer number (2884891070880).

Almost surely, 2^{61551211517211} is an apocalyptic number.

61551211517211 is a deficient number, since it is larger than the sum of its proper divisors (30765302750949).

61551211517211 is a wasteful number, since it uses less digits than its factorization.

61551211517211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528368475.

The product of its digits is 21000, while the sum is 39.

The spelling of 61551211517211 in words is "sixty-one trillion, five hundred fifty-one billion, two hundred eleven million, five hundred seventeen thousand, two hundred eleven".