861722822709 has 48 divisors (see below), whose sum is σ = 1485011204352. Its totient is φ = 470802081024.

The previous prime is 861722822659. The next prime is 861722822731. The reversal of 861722822709 is 907228227168.

861722822709 is a `hidden beast` number, since 86 + 17 + 2 + 282 + 270 + 9 = 666.

It is not a de Polignac number, because 861722822709 - 2⁹ = 861722822197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861722822789) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3289137 + ... + 3541449.

It is an arithmetic number, because the mean of its divisors is an integer number (30937733424).

Almost surely, 2^861722822709 is an apocalyptic number.

It is an amenable number.

861722822709 is a deficient number, since it is larger than the sum of its proper divisors (623288381643).

861722822709 is a wasteful number, since it uses less digits than its factorization.

861722822709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254706 (or 254703 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 861722822709 in words is "eight hundred sixty-one billion, seven hundred twenty-two million, eight hundred twenty-two thousand, seven hundred nine".