61033266440 has 64 divisors (see below), whose sum is σ = 144208546560. Its totient is φ = 23203065600.

The previous prime is 61033266403. The next prime is 61033266443. The reversal of 61033266440 is 4466233016.

It is a super-2 number, since 2×61033266440² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61033266440.

It is not an unprimeable number, because it can be changed into a prime (61033266443) 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, 66836 + ... + 355715.

It is an arithmetic number, because the mean of its divisors is an integer number (2253258540).

Almost surely, 2^61033266440 is an apocalyptic number.

It is an amenable number.

61033266440 is an abundant number, since it is smaller than the sum of its proper divisors (83175280120).

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

61033266440 is a wasteful number, since it uses less digits than its factorization.

61033266440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422742 (or 422738 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

Adding to 61033266440 its reverse (4466233016), we get a palindrome (65499499456).

The spelling of 61033266440 in words is "sixty-one billion, thirty-three million, two hundred sixty-six thousand, four hundred forty".