61449019842 has 64 divisors (see below), whose sum is σ = 149270273280. Its totient is φ = 16462626816.

The previous prime is 61449019823. The next prime is 61449019873. The reversal of 61449019842 is 24891094416.

It is a junction number, because it is equal to n+sod(n) for n = 61449019791 and 61449019800.

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 31 ways as a sum of consecutive naturals, for example, 32098 + ... + 352034.

It is an arithmetic number, because the mean of its divisors is an integer number (2332348020).

Almost surely, 2^61449019842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61449019842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74635136640).

61449019842 is an abundant number, since it is smaller than the sum of its proper divisors (87821253438).

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

61449019842 is a wasteful number, since it uses less digits than its factorization.

61449019842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320235.

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 61449019842 in words is "sixty-one billion, four hundred forty-nine million, nineteen thousand, eight hundred forty-two".