40661764242 has 64 divisors (see below), whose sum is σ = 90433082880. Its totient is φ = 12085488000.

The previous prime is 40661764217. The next prime is 40661764243. The reversal of 40661764242 is 24246716604.

It is a junction number, because it is equal to n+sod(n) for n = 40661764194 and 40661764203.

It is not an unprimeable number, because it can be changed into a prime (40661764243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734742 + ... + 788142.

It is an arithmetic number, because the mean of its divisors is an integer number (1413016920).

Almost surely, 2^40661764242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40661764242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45216541440).

40661764242 is an abundant number, since it is smaller than the sum of its proper divisors (49771318638).

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

40661764242 is a wasteful number, since it uses less digits than its factorization.

40661764242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53639.

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 40661764242 in words is "forty billion, six hundred sixty-one million, seven hundred sixty-four thousand, two hundred forty-two".