61043041040 has 80 divisors (see below), whose sum is σ = 154335179952. Its totient is φ = 22359785472.

The previous prime is 61043041013. The next prime is 61043041043. The reversal of 61043041040 is 4014034016.

It can be written as a sum of positive squares in 8 ways, for example, as 19342133776 + 41700907264 = 139076^2 + 204208^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×61043041040² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61043040997 and 61043041015.

It is not an unprimeable number, because it can be changed into a prime (61043041043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556229 + ... + 656868.

Almost surely, 2^61043041040 is an apocalyptic number.

It is an amenable number.

61043041040 is an abundant number, since it is smaller than the sum of its proper divisors (93292138912).

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

61043041040 is a wasteful number, since it uses less digits than its factorization.

61043041040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213164 (or 1213158 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 61043041040 its reverse (4014034016), we get a palindrome (65057075056).

The spelling of 61043041040 in words is "sixty-one billion, forty-three million, forty-one thousand, forty".