40023650521 has 8 divisors (see below), whose sum is σ = 40254616584. Its totient is φ = 39792792960.

The previous prime is 40023650489. The next prime is 40023650539. The reversal of 40023650521 is 12505632004.

It can be written as a sum of positive squares in 4 ways, for example, as 2130745600 + 37892904921 = 46160^2 + 194661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40023650521 - 2⁵ = 40023650489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40023650521.

It is not an unprimeable number, because it can be changed into a prime (40023650021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781911 + ... + 831523.

It is an arithmetic number, because the mean of its divisors is an integer number (5031827073).

Almost surely, 2^40023650521 is an apocalyptic number.

It is an amenable number.

40023650521 is a deficient number, since it is larger than the sum of its proper divisors (230966063).

40023650521 is a wasteful number, since it uses less digits than its factorization.

40023650521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54251.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 40023650521 in words is "forty billion, twenty-three million, six hundred fifty thousand, five hundred twenty-one".