61400405205 has 24 divisors (see below), whose sum is σ = 111054647808. Its totient is φ = 31323104736.

The previous prime is 61400405203. The next prime is 61400405249. The reversal of 61400405205 is 50250400416.

61400405205 is a `hidden beast` number, since 61 + 40 + 0 + 40 + 520 + 5 = 666.

It is not a de Polignac number, because 61400405205 - 2¹ = 61400405203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61400405203) 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 23 ways as a sum of consecutive naturals, for example, 29660997 + ... + 29663066.

It is an arithmetic number, because the mean of its divisors is an integer number (4627276992).

Almost surely, 2^61400405205 is an apocalyptic number.

It is an amenable number.

61400405205 is a deficient number, since it is larger than the sum of its proper divisors (49654242603).

61400405205 is a wasteful number, since it uses less digits than its factorization.

61400405205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59324097 (or 59324094 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 61400405205 in words is "sixty-one billion, four hundred million, four hundred five thousand, two hundred five".