61581330393973 has 16 divisors (see below), whose sum is σ = 66354446188800. Its totient is φ = 56813375891520.

The previous prime is 61581330393953. The next prime is 61581330393991. The reversal of 61581330393973 is 37939303318516.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61581330393973 - 2¹⁷ = 61581330262901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61581330393953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281780418 + ... + 281998876.

It is an arithmetic number, because the mean of its divisors is an integer number (4147152886800).

Almost surely, 2^{61581330393973} is an apocalyptic number.

It is an amenable number.

61581330393973 is a deficient number, since it is larger than the sum of its proper divisors (4773115794827).

61581330393973 is a wasteful number, since it uses less digits than its factorization.

61581330393973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230172.

The product of its (nonzero) digits is 33067440, while the sum is 61.

The spelling of 61581330393973 in words is "sixty-one trillion, five hundred eighty-one billion, three hundred thirty million, three hundred ninety-three thousand, nine hundred seventy-three".