61021990224 has 600 divisors, whose sum is σ = 204880220160. Its totient is φ = 17424336384.

The previous prime is 61021990201. The next prime is 61021990241. The reversal of 61021990224 is 42209912016.

61021990224 is a `hidden beast` number, since 610 + 2 + 19 + 9 + 0 + 2 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 119 ways as a sum of consecutive naturals, for example, 480488049 + ... + 480488175.

Almost surely, 2^61021990224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61021990224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102440110080).

61021990224 is an abundant number, since it is smaller than the sum of its proper divisors (143858229936).

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

61021990224 is a wasteful number, since it uses less digits than its factorization.

61021990224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 61021990224 in words is "sixty-one billion, twenty-one million, nine hundred ninety thousand, two hundred twenty-four".