861152609780 has 48 divisors (see below), whose sum is σ = 1829786112000. Its totient is φ = 340395830016.

The previous prime is 861152609771. The next prime is 861152609819. The reversal of 861152609780 is 87906251168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2993501 + ... + 3268539.

It is an arithmetic number, because the mean of its divisors is an integer number (38120544000).

Almost surely, 2^861152609780 is an apocalyptic number.

It is an amenable number.

861152609780 is an abundant number, since it is smaller than the sum of its proper divisors (968633502220).

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

861152609780 is a wasteful number, since it uses less digits than its factorization.

861152609780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276896 (or 276894 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 861152609780 in words is "eight hundred sixty-one billion, one hundred fifty-two million, six hundred nine thousand, seven hundred eighty".