861826429550 has 12 divisors (see below), whose sum is σ = 1602997159056. Its totient is φ = 344730571800.

The previous prime is 861826429531. The next prime is 861826429609. The reversal of 861826429550 is 55924628168.

It is a happy number.

It is a super-2 number, since 2×861826429550² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8618264246 + ... + 8618264345.

It is an arithmetic number, because the mean of its divisors is an integer number (133583096588).

Almost surely, 2^861826429550 is an apocalyptic number.

861826429550 is a deficient number, since it is larger than the sum of its proper divisors (741170729506).

861826429550 is a wasteful number, since it uses less digits than its factorization.

861826429550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17236528603 (or 17236528598 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 861826429550 in words is "eight hundred sixty-one billion, eight hundred twenty-six million, four hundred twenty-nine thousand, five hundred fifty".