40518619920 has 60 divisors (see below), whose sum is σ = 136075034316. Its totient is φ = 10804965120.

The previous prime is 40518619909. The next prime is 40518619949. The reversal of 40518619920 is 2991681504.

40518619920 is a `hidden beast` number, since 4 + 0 + 5 + 1 + 8 + 619 + 9 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4118558976 + 36400060944 = 64176^2 + 190788^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28137211 + ... + 28138650.

Almost surely, 2^40518619920 is an apocalyptic number.

40518619920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40518619920 is an abundant number, since it is smaller than the sum of its proper divisors (95556414396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40518619920 is a wasteful number, since it uses less digits than its factorization.

40518619920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56275880 (or 56275871 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 40518619920 in words is "forty billion, five hundred eighteen million, six hundred nineteen thousand, nine hundred twenty".