861769494324 has 18 divisors (see below), whose sum is σ = 2178361777410. Its totient is φ = 287256498096.

The previous prime is 861769494301. The next prime is 861769494329. The reversal of 861769494324 is 423494967168.

It is a happy number.

861769494324 is a `hidden beast` number, since 8 + 61 + 7 + 69 + 494 + 3 + 24 = 666.

It can be written as a sum of positive squares in only one way, i.e., 469745744400 + 392023749924 = 685380^2 + 626118^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×861769494324² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861769494329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11969020719 + ... + 11969020790.

It is an arithmetic number, because the mean of its divisors is an integer number (121020098745).

Almost surely, 2^861769494324 is an apocalyptic number.

It is an amenable number.

861769494324 is an abundant number, since it is smaller than the sum of its proper divisors (1316592283086).

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

861769494324 is a wasteful number, since it uses less digits than its factorization.

861769494324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23938041519 (or 23938041514 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 861769494324 in words is "eight hundred sixty-one billion, seven hundred sixty-nine million, four hundred ninety-four thousand, three hundred twenty-four".