40021140563465 has 4 divisors (see below), whose sum is σ = 48025368676164. Its totient is φ = 32016912450768.

The previous prime is 40021140563449. The next prime is 40021140563471. The reversal of 40021140563465 is 56436504112004.

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 15817141463929 + 24203999099536 = 3977077^2 + 4919756^2 .

It is a cyclic number.

It is not a de Polignac number, because 40021140563465 - 2⁴ = 40021140563449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4002114056342 + ... + 4002114056351.

It is an arithmetic number, because the mean of its divisors is an integer number (12006342169041).

Almost surely, 2^{40021140563465} is an apocalyptic number.

It is an amenable number.

40021140563465 is a deficient number, since it is larger than the sum of its proper divisors (8004228112699).

40021140563465 is an equidigital number, since it uses as much as digits as its factorization.

40021140563465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004228112698.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 40021140563465 its reverse (56436504112004), we get a palindrome (96457644675469).

The spelling of 40021140563465 in words is "forty trillion, twenty-one billion, one hundred forty million, five hundred sixty-three thousand, four hundred sixty-five".