61310643438 has 32 divisors (see below), whose sum is σ = 133782865920. Its totient is φ = 18577012160.

The previous prime is 61310643437. The next prime is 61310643529. The reversal of 61310643438 is 83434601316.

It is a junction number, because it is equal to n+sod(n) for n = 61310643396 and 61310643405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61310643437) 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, 652906 + ... + 740882.

It is an arithmetic number, because the mean of its divisors is an integer number (4180714560).

Almost surely, 2^61310643438 is an apocalyptic number.

61310643438 is an abundant number, since it is smaller than the sum of its proper divisors (72472222482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61310643438 is a wasteful number, since it uses less digits than its factorization.

61310643438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98552.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 61310643438 in words is "sixty-one billion, three hundred ten million, six hundred forty-three thousand, four hundred thirty-eight".