42623749656 has 96 divisors (see below), whose sum is σ = 119887584960. Its totient is φ = 13670306496.

The previous prime is 42623749643. The next prime is 42623749657. The reversal of 42623749656 is 65694732624.

42623749656 is a `hidden beast` number, since 4 + 2 + 623 + 7 + 4 + 9 + 6 + 5 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42623749657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104691 + ... + 310173.

It is an arithmetic number, because the mean of its divisors is an integer number (1248829010).

Almost surely, 2^42623749656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42623749656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59943792480).

42623749656 is an abundant number, since it is smaller than the sum of its proper divisors (77263835304).

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

42623749656 is a wasteful number, since it uses less digits than its factorization.

42623749656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205605 (or 205598 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 42623749656 in words is "forty-two billion, six hundred twenty-three million, seven hundred forty-nine thousand, six hundred fifty-six".