861315002000 has 40 divisors (see below), whose sum is σ = 2082659679672. Its totient is φ = 344526000000.

The previous prime is 861315001999. The next prime is 861315002083. The reversal of 861315002000 is 200513168.

861315002000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30679624336 + 830635377664 = 175156^2 + 911392^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215326751 + ... + 215330750.

Almost surely, 2^861315002000 is an apocalyptic number.

861315002000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861315002000 is an abundant number, since it is smaller than the sum of its proper divisors (1221344677672).

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

861315002000 is a wasteful number, since it uses less digits than its factorization.

861315002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430657524 (or 430657508 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 861315002000 its reverse (200513168), we get a palindrome (861515515168).

The spelling of 861315002000 in words is "eight hundred sixty-one billion, three hundred fifteen million, two thousand".