861905229012 has 72 divisors (see below), whose sum is σ = 2183729184000. Its totient is φ = 286639557120.

The previous prime is 861905229007. The next prime is 861905229023. The reversal of 861905229012 is 210922509168.

It is a happy number.

861905229012 is a `hidden beast` number, since 8 + 619 + 0 + 5 + 2 + 29 + 0 + 1 + 2 = 666.

It is a super-2 number, since 2×861905229012² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92563837 + ... + 92573147.

It is an arithmetic number, because the mean of its divisors is an integer number (30329572000).

Almost surely, 2^861905229012 is an apocalyptic number.

It is an amenable number.

861905229012 is an abundant number, since it is smaller than the sum of its proper divisors (1321823954988).

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

861905229012 is a wasteful number, since it uses less digits than its factorization.

861905229012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14973 (or 14968 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 861905229012 in words is "eight hundred sixty-one billion, nine hundred five million, two hundred twenty-nine thousand, twelve".