61229129140 has 48 divisors (see below), whose sum is σ = 128883000960. Its totient is φ = 24434238080.

The previous prime is 61229129119. The next prime is 61229129147. The reversal of 61229129140 is 4192192216.

It is a self number, because there is not a number n which added to its sum of digits gives 61229129140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61229129147) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 25394535 + ... + 25396945.

It is an arithmetic number, because the mean of its divisors is an integer number (2685062520).

Almost surely, 2^61229129140 is an apocalyptic number.

It is an amenable number.

61229129140 is an abundant number, since it is smaller than the sum of its proper divisors (67653871820).

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

61229129140 is a wasteful number, since it uses less digits than its factorization.

61229129140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872 (or 4870 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 61229129140 in words is "sixty-one billion, two hundred twenty-nine million, one hundred twenty-nine thousand, one hundred forty".