861745550 has 24 divisors (see below), whose sum is σ = 1633094136. Its totient is φ = 338193440.

The previous prime is 861745543. The next prime is 861745553. The reversal of 861745550 is 55547168.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 861745498 and 861745507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861745553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159944 + ... + 165243.

It is an arithmetic number, because the mean of its divisors is an integer number (68045589).

Almost surely, 2^861745550 is an apocalyptic number.

861745550 is a deficient number, since it is larger than the sum of its proper divisors (771348586).

861745550 is a wasteful number, since it uses less digits than its factorization.

861745550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325252 (or 325247 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 861745550 is about 29355.5028912809. The cubic root of 861745550 is about 951.6115030582.

The spelling of 861745550 in words is "eight hundred sixty-one million, seven hundred forty-five thousand, five hundred fifty".