61043909250 has 64 divisors (see below), whose sum is σ = 152600153472. Its totient is φ = 16253316800.

The previous prime is 61043909249. The next prime is 61043909257. The reversal of 61043909250 is 5290934016.

It is a junction number, because it is equal to n+sod(n) for n = 61043909199 and 61043909208.

It is not an unprimeable number, because it can be changed into a prime (61043909257) 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, 427429 + ... + 552071.

It is an arithmetic number, because the mean of its divisors is an integer number (2384377398).

Almost surely, 2^61043909250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61043909250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76300076736).

61043909250 is an abundant number, since it is smaller than the sum of its proper divisors (91556244222).

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

61043909250 is a wasteful number, since it uses less digits than its factorization.

61043909250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125316 (or 125306 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 61043909250 in words is "sixty-one billion, forty-three million, nine hundred nine thousand, two hundred fifty".