61121250040 has 64 divisors (see below), whose sum is σ = 138536640000. Its totient is φ = 24268844160.

The previous prime is 61121250023. The next prime is 61121250041. The reversal of 61121250040 is 4005212116.

61121250040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 61121249993 and 61121250020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121250041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3485695 + ... + 3503185.

It is an arithmetic number, because the mean of its divisors is an integer number (2164635000).

Almost surely, 2^61121250040 is an apocalyptic number.

It is an amenable number.

61121250040 is an abundant number, since it is smaller than the sum of its proper divisors (77415389960).

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

61121250040 is a wasteful number, since it uses less digits than its factorization.

61121250040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18140 (or 18136 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 61121250040 its reverse (4005212116), we get a palindrome (65126462156).

The spelling of 61121250040 in words is "sixty-one billion, one hundred twenty-one million, two hundred fifty thousand, forty".