858721508650 has 24 divisors (see below), whose sum is σ = 1599022789920. Its totient is φ = 343101338160.

The previous prime is 858721508647. The next prime is 858721508677. The reversal of 858721508650 is 56805127858.

It is a junction number, because it is equal to n+sod(n) for n = 858721508591 and 858721508600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9636840 + ... + 9725539.

It is an arithmetic number, because the mean of its divisors is an integer number (66625949580).

Almost surely, 2^858721508650 is an apocalyptic number.

858721508650 is a deficient number, since it is larger than the sum of its proper divisors (740301281270).

858721508650 is a wasteful number, since it uses less digits than its factorization.

858721508650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19363278 (or 19363273 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 55.

The spelling of 858721508650 in words is "eight hundred fifty-eight billion, seven hundred twenty-one million, five hundred eight thousand, six hundred fifty".