861101897878 has 8 divisors (see below), whose sum is σ = 1291659439680. Its totient is φ = 430548751320.

The previous prime is 861101897813. The next prime is 861101897921. The reversal of 861101897878 is 878798101168.

861101897878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555238 + ... + 1424953.

It is an arithmetic number, because the mean of its divisors is an integer number (161457429960).

Almost surely, 2^861101897878 is an apocalyptic number.

861101897878 is a deficient number, since it is larger than the sum of its proper divisors (430557541802).

861101897878 is a wasteful number, since it uses less digits than its factorization.

861101897878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197622.

The product of its (nonzero) digits is 10838016, while the sum is 64.

The spelling of 861101897878 in words is "eight hundred sixty-one billion, one hundred one million, eight hundred ninety-seven thousand, eight hundred seventy-eight".