61645499454616 has 128 divisors (see below), whose sum is σ = 148766872043520. Its totient is φ = 23241099600000.

The previous prime is 61645499454599. The next prime is 61645499454659.

61645499454616 is nontrivially palindromic in base 10.

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 31 ways as a sum of consecutive naturals, for example, 251008761 + ... + 251254231.

It is an arithmetic number, because the mean of its divisors is an integer number (1162241187840).

Almost surely, 2^{61645499454616} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61645499454616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74383436021760).

61645499454616 is an abundant number, since it is smaller than the sum of its proper divisors (87121372588904).

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

61645499454616 is a wasteful number, since it uses less digits than its factorization.

61645499454616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258677 (or 258673 counting only the distinct ones).

The product of its digits is 671846400, while the sum is 70.

The spelling of 61645499454616 in words is "sixty-one trillion, six hundred forty-five billion, four hundred ninety-nine million, four hundred fifty-four thousand, six hundred sixteen".