40351066564021 has 4 divisors (see below), whose sum is σ = 40363751592844. Its totient is φ = 40338381535200.

The previous prime is 40351066563947. The next prime is 40351066564049. The reversal of 40351066564021 is 12046566015304.

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 2959810568100 + 37391255995921 = 1720410^2 + 6114839^2 .

It is a cyclic number.

It is not a de Polignac number, because 40351066564021 - 2⁷ = 40351066563893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40351066564091) 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, 6342509640 + ... + 6342516001.

It is an arithmetic number, because the mean of its divisors is an integer number (10090937898211).

Almost surely, 2^{40351066564021} is an apocalyptic number.

It is an amenable number.

40351066564021 is a deficient number, since it is larger than the sum of its proper divisors (12685028823).

40351066564021 is a wasteful number, since it uses less digits than its factorization.

40351066564021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12685028822.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 40351066564021 in words is "forty trillion, three hundred fifty-one billion, sixty-six million, five hundred sixty-four thousand, twenty-one".