61265781944 has 32 divisors (see below), whose sum is σ = 115214022000. Its totient is φ = 30542150400.

The previous prime is 61265781943. The next prime is 61265781953. The reversal of 61265781944 is 44918756216.

It is a happy number.

61265781944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61265781943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5299082 + ... + 5310630.

Almost surely, 2^61265781944 is an apocalyptic number.

It is an amenable number.

61265781944 is a deficient number, since it is larger than the sum of its proper divisors (53948240056).

61265781944 is a wasteful number, since it uses less digits than its factorization.

61265781944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463 (or 13459 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The spelling of 61265781944 in words is "sixty-one billion, two hundred sixty-five million, seven hundred eighty-one thousand, nine hundred forty-four".