40155331521 has 4 divisors (see below), whose sum is σ = 53540442032. Its totient is φ = 26770221012.

The previous prime is 40155331511. The next prime is 40155331523. The reversal of 40155331521 is 12513355104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40155331521 - 2⁷ = 40155331393 is a prime.

It is a super-2 number, since 2×40155331521² (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 (40155331523) 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 3 ways as a sum of consecutive naturals, for example, 6692555251 + ... + 6692555256.

It is an arithmetic number, because the mean of its divisors is an integer number (13385110508).

Almost surely, 2^40155331521 is an apocalyptic number.

It is an amenable number.

40155331521 is a deficient number, since it is larger than the sum of its proper divisors (13385110511).

40155331521 is a wasteful number, since it uses less digits than its factorization.

40155331521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13385110510.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 40155331521 its reverse (12513355104), we get a palindrome (52668686625).

The spelling of 40155331521 in words is "forty billion, one hundred fifty-five million, three hundred thirty-one thousand, five hundred twenty-one".