61003003656 has 128 divisors (see below), whose sum is σ = 179638272000. Its totient is φ = 16901851392.

The previous prime is 61003003577. The next prime is 61003003681. The reversal of 61003003656 is 65630030016.

61003003656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 825225 + ... + 896103.

It is an arithmetic number, because the mean of its divisors is an integer number (1403424000).

Almost surely, 2^61003003656 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 61003003656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89819136000).

61003003656 is an abundant number, since it is smaller than the sum of its proper divisors (118635268344).

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

61003003656 is a wasteful number, since it uses less digits than its factorization.

61003003656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71051 (or 71047 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The spelling of 61003003656 in words is "sixty-one billion, three million, three thousand, six hundred fifty-six".