40017506420657 has 4 divisors (see below), whose sum is σ = 42371477386596. Its totient is φ = 37663535454720.

The previous prime is 40017506420597. The next prime is 40017506420699. The reversal of 40017506420657 is 75602460571004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31594921516096 + 8422584904561 = 5620936^2 + 2902169^2 .

It is a cyclic number.

It is not a de Polignac number, because 40017506420657 - 2¹⁰ = 40017506419633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40017506420057) 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, 1176985482944 + ... + 1176985482977.

It is an arithmetic number, because the mean of its divisors is an integer number (10592869346649).

Almost surely, 2^{40017506420657} is an apocalyptic number.

It is an amenable number.

40017506420657 is a deficient number, since it is larger than the sum of its proper divisors (2353970965939).

40017506420657 is a wasteful number, since it uses less digits than its factorization.

40017506420657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353970965938.

The product of its (nonzero) digits is 1411200, while the sum is 47.

The spelling of 40017506420657 in words is "forty trillion, seventeen billion, five hundred six million, four hundred twenty thousand, six hundred fifty-seven".