61644021150 has 96 divisors (see below), whose sum is σ = 156900457728. Its totient is φ = 16011385600.

The previous prime is 61644021133. The next prime is 61644021163. The reversal of 61644021150 is 5112044616.

It is a super-4 number, since 4×61644021150⁴ (a number of 44 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 849082 + ... + 918818.

It is an arithmetic number, because the mean of its divisors is an integer number (1634379768).

Almost surely, 2^61644021150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61644021150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78450228864).

61644021150 is an abundant number, since it is smaller than the sum of its proper divisors (95256436578).

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

61644021150 is a wasteful number, since it uses less digits than its factorization.

61644021150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69906 (or 69901 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 61644021150 its reverse (5112044616), we get a palindrome (66756065766).

The spelling of 61644021150 in words is "sixty-one billion, six hundred forty-four million, twenty-one thousand, one hundred fifty".