42651749529 has 21 divisors (see below), whose sum is σ = 63956732143. Its totient is φ = 28430782272.

The previous prime is 42651749509. The next prime is 42651749533. The reversal of 42651749529 is 92594715624.

It is a happy number.

The square root of 42651749529 is 206523.

It is a perfect power (a square), and thus also a powerful number.

42651749529 is a `hidden beast` number, since 4 + 2 + 65 + 17 + 49 + 529 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1863907929 + 40787841600 = 43173^2 + 201960^2 .

It is not a de Polignac number, because 42651749529 - 2³¹ = 40504265881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42651749509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 5572297 + ... + 5579945.

Almost surely, 2^42651749529 is an apocalyptic number.

42651749529 is the 206523-rd square number.

42651749529 is the 103262-nd centered octagonal number.

It is an amenable number.

42651749529 is a deficient number, since it is larger than the sum of its proper divisors (21304982614).

42651749529 is an frugal number, since it uses more digits than its factorization.

42651749529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15316 (or 7652 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 42651749529 in words is "forty-two billion, six hundred fifty-one million, seven hundred forty-nine thousand, five hundred twenty-nine".