61503021066636 has 144 divisors (see below), whose sum is σ = 165061297346400. Its totient is φ = 19279553965056.

The previous prime is 61503021066587. The next prime is 61503021066637. The reversal of 61503021066636 is 63666012030516.

It is a junction number, because it is equal to n+sod(n) for n = 61503021066591 and 61503021066600.

It is not an unprimeable number, because it can be changed into a prime (61503021066637) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1285666 + ... + 11165078.

It is an arithmetic number, because the mean of its divisors is an integer number (1146259009350).

Almost surely, 2^{61503021066636} 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 61503021066636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82530648673200).

61503021066636 is an abundant number, since it is smaller than the sum of its proper divisors (103558276279764).

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

61503021066636 is a wasteful number, since it uses less digits than its factorization.

61503021066636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9879608 (or 9879603 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 61503021066636 in words is "sixty-one trillion, five hundred three billion, twenty-one million, sixty-six thousand, six hundred thirty-six".