61223225490 has 384 divisors, whose sum is σ = 196113415680. Its totient is φ = 13450364928.

The previous prime is 61223225473. The next prime is 61223225501. The reversal of 61223225490 is 9452232216.

61223225490 is a `hidden beast` number, since 61 + 22 + 32 + 2 + 549 + 0 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 56013384 + ... + 56014476.

It is an arithmetic number, because the mean of its divisors is an integer number (510712020).

Almost surely, 2^61223225490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61223225490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98056707840).

61223225490 is an abundant number, since it is smaller than the sum of its proper divisors (134890190190).

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

61223225490 is a wasteful number, since it uses less digits than its factorization.

61223225490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 61223225490 in words is "sixty-one billion, two hundred twenty-three million, two hundred twenty-five thousand, four hundred ninety".