40520042451 has 64 divisors (see below), whose sum is σ = 70772136960. Its totient is φ = 22434382080.

The previous prime is 40520042417. The next prime is 40520042491. The reversal of 40520042451 is 15424002504.

40520042451 is a `hidden beast` number, since 4 + 0 + 5 + 200 + 4 + 2 + 451 = 666.

It is not a de Polignac number, because 40520042451 - 2¹⁴ = 40520026067 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (40520042491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 746215 + ... + 798671.

It is an arithmetic number, because the mean of its divisors is an integer number (1105814640).

Almost surely, 2^40520042451 is an apocalyptic number.

40520042451 is a deficient number, since it is larger than the sum of its proper divisors (30252094509).

40520042451 is a wasteful number, since it uses less digits than its factorization.

40520042451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52601 (or 52595 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 40520042451 its reverse (15424002504), we get a palindrome (55944044955).

The spelling of 40520042451 in words is "forty billion, five hundred twenty million, forty-two thousand, four hundred fifty-one".