61000561000 has 64 divisors (see below), whose sum is σ = 144548352000. Its totient is φ = 24091329600.

The previous prime is 61000560989. The next prime is 61000561021. The reversal of 61000561000 is 16500016.

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 15 ways as a sum of consecutive naturals, for example, 307080 + ... + 465079.

It is an arithmetic number, because the mean of its divisors is an integer number (2258568000).

Almost surely, 2^61000561000 is an apocalyptic number.

It is an amenable number.

61000561000 is an abundant number, since it is smaller than the sum of its proper divisors (83547791000).

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

61000561000 is a wasteful number, since it uses less digits than its factorization.

61000561000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772259 (or 772245 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The spelling of 61000561000 in words is "sixty-one billion, five hundred sixty-one thousand".