61220427885 has 32 divisors (see below), whose sum is σ = 109132961280. Its totient is φ = 32561901504.

The previous prime is 61220427881. The next prime is 61220427901. The reversal of 61220427885 is 58872402216.

61220427885 is a `hidden beast` number, since 612 + 2 + 0 + 4 + 27 + 8 + 8 + 5 = 666.

It is not a de Polignac number, because 61220427885 - 2² = 61220427881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 61220427885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61220427881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 568282 + ... + 667371.

It is an arithmetic number, because the mean of its divisors is an integer number (3410405040).

Almost surely, 2^61220427885 is an apocalyptic number.

It is an amenable number.

61220427885 is a deficient number, since it is larger than the sum of its proper divisors (47912533395).

61220427885 is a wasteful number, since it uses less digits than its factorization.

61220427885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236034 (or 1236028 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 61220427885 in words is "sixty-one billion, two hundred twenty million, four hundred twenty-seven thousand, eight hundred eighty-five".