61281545388 has 48 divisors (see below), whose sum is σ = 163430125824. Its totient is φ = 17507655360.

The previous prime is 61281545383. The next prime is 61281545389. The reversal of 61281545388 is 88354518216.

It is a self number, because there is not a number n which added to its sum of digits gives 61281545388.

It is not an unprimeable number, because it can be changed into a prime (61281545383) 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, 1652506 + ... + 1689182.

It is an arithmetic number, because the mean of its divisors is an integer number (3404794288).

Almost surely, 2^61281545388 is an apocalyptic number.

It is an amenable number.

61281545388 is an abundant number, since it is smaller than the sum of its proper divisors (102148580436).

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

61281545388 is a wasteful number, since it uses less digits than its factorization.

61281545388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56582 (or 56580 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 51.

The spelling of 61281545388 in words is "sixty-one billion, two hundred eighty-one million, five hundred forty-five thousand, three hundred eighty-eight".