61505589568 has 28 divisors (see below), whose sum is σ = 122092224192. Its totient is φ = 30742194560.

The previous prime is 61505589511. The next prime is 61505589581. The reversal of 61505589568 is 86598550516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23163 + ... + 351493.

Almost surely, 2^61505589568 is an apocalyptic number.

It is an amenable number.

61505589568 is a deficient number, since it is larger than the sum of its proper divisors (60586634624).

61505589568 is a wasteful number, since it uses less digits than its factorization.

61505589568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331270 (or 331260 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 58.

The spelling of 61505589568 in words is "sixty-one billion, five hundred five million, five hundred eighty-nine thousand, five hundred sixty-eight".