61445835880 has 64 divisors (see below), whose sum is σ = 162423273600. Its totient is φ = 20625173760.

The previous prime is 61445835811. The next prime is 61445835901. The reversal of 61445835880 is 8853854416.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

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, 5365420 + ... + 5376859.

It is an arithmetic number, because the mean of its divisors is an integer number (2537863650).

Almost surely, 2^61445835880 is an apocalyptic number.

It is an amenable number.

61445835880 is an abundant number, since it is smaller than the sum of its proper divisors (100977437720).

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

61445835880 is a wasteful number, since it uses less digits than its factorization.

61445835880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10742314 (or 10742310 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 52.

The spelling of 61445835880 in words is "sixty-one billion, four hundred forty-five million, eight hundred thirty-five thousand, eight hundred eighty".