40154124521 has 6 divisors (see below), whose sum is σ = 46709900010. Its totient is φ = 34417820976.

The previous prime is 40154124499. The next prime is 40154124529. The reversal of 40154124521 is 12542145104.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 29460289600 + 10693834921 = 171640^2 + 103411^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40154124521 is a prime.

It is a super-2 number, since 2×40154124521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40154124529) 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 5 ways as a sum of consecutive naturals, for example, 409735916 + ... + 409736013.

It is an arithmetic number, because the mean of its divisors is an integer number (7784983335).

Almost surely, 2^40154124521 is an apocalyptic number.

It is an amenable number.

40154124521 is a deficient number, since it is larger than the sum of its proper divisors (6555775489).

40154124521 is an equidigital number, since it uses as much as digits as its factorization.

40154124521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819471943 (or 819471936 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 40154124521 its reverse (12542145104), we get a palindrome (52696269625).

The spelling of 40154124521 in words is "forty billion, one hundred fifty-four million, one hundred twenty-four thousand, five hundred twenty-one".