40154526561 has 4 divisors (see below), whose sum is σ = 53539368752. Its totient is φ = 26769684372.

The previous prime is 40154526499. The next prime is 40154526571. The reversal of 40154526561 is 16562545104.

40154526561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40154526561 - 2²⁶ = 40087417697 is a prime.

It is a super-2 number, since 2×40154526561² (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 (40154526571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6692421091 + ... + 6692421096.

It is an arithmetic number, because the mean of its divisors is an integer number (13384842188).

Almost surely, 2^40154526561 is an apocalyptic number.

It is an amenable number.

40154526561 is a deficient number, since it is larger than the sum of its proper divisors (13384842191).

40154526561 is a wasteful number, since it uses less digits than its factorization.

40154526561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13384842190.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 40154526561 in words is "forty billion, one hundred fifty-four million, five hundred twenty-six thousand, five hundred sixty-one".