40020427451 has 4 divisors (see below), whose sum is σ = 40022700000. Its totient is φ = 40018154904.

The previous prime is 40020427439. The next prime is 40020427459. The reversal of 40020427451 is 15472402004.

40020427451 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40020427451 is a prime.

It is a super-2 number, since 2×40020427451² (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 (40020427459) 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, 1109651 + ... + 1145148.

It is an arithmetic number, because the mean of its divisors is an integer number (10005675000).

Almost surely, 2^40020427451 is an apocalyptic number.

40020427451 is a deficient number, since it is larger than the sum of its proper divisors (2272549).

40020427451 is a wasteful number, since it uses less digits than its factorization.

40020427451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272548.

The product of its (nonzero) digits is 8960, while the sum is 29.

Adding to 40020427451 its reverse (15472402004), we get a palindrome (55492829455).

The spelling of 40020427451 in words is "forty billion, twenty million, four hundred twenty-seven thousand, four hundred fifty-one".