105212757861 has 24 divisors (see below), whose sum is σ = 157672779264. Its totient is φ = 67534598880.

The previous prime is 105212757841. The next prime is 105212757883. The reversal of 105212757861 is 168757212501.

105212757861 is a `hidden beast` number, since 1 + 0 + 5 + 2 + 12 + 7 + 578 + 61 = 666.

It is not a de Polignac number, because 105212757861 - 2⁵ = 105212757829 is a prime.

It is a super-2 number, since 2×105212757861² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105212757841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 902161 + ... + 1012086.

It is an arithmetic number, because the mean of its divisors is an integer number (6569699136).

Almost surely, 2^105212757861 is an apocalyptic number.

It is an amenable number.

105212757861 is a deficient number, since it is larger than the sum of its proper divisors (52460021403).

105212757861 is a wasteful number, since it uses less digits than its factorization.

105212757861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914481 (or 1914478 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 45.

The spelling of 105212757861 in words is "one hundred five billion, two hundred twelve million, seven hundred fifty-seven thousand, eight hundred sixty-one".