40851569921 has 4 divisors (see below), whose sum is σ = 40984637232. Its totient is φ = 40718502612.

The previous prime is 40851569903. The next prime is 40851569923. The reversal of 40851569921 is 12996515804.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40851569921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40851569921.

It is not an unprimeable number, because it can be changed into a prime (40851569923) 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, 66533195 + ... + 66533808.

It is an arithmetic number, because the mean of its divisors is an integer number (10246159308).

Almost surely, 2^40851569921 is an apocalyptic number.

It is an amenable number.

40851569921 is a deficient number, since it is larger than the sum of its proper divisors (133067311).

40851569921 is a wasteful number, since it uses less digits than its factorization.

40851569921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133067310.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 40851569921 in words is "forty billion, eight hundred fifty-one million, five hundred sixty-nine thousand, nine hundred twenty-one".