40172421655 has 8 divisors (see below), whose sum is σ = 48208803984. Its totient is φ = 32136672000.

The previous prime is 40172421647. The next prime is 40172421673. The reversal of 40172421655 is 55612427104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40172421655 - 2³ = 40172421647 is a prime.

It is a super-2 number, since 2×40172421655² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4986 + ... + 283495.

It is an arithmetic number, because the mean of its divisors is an integer number (6026100498).

Almost surely, 2^40172421655 is an apocalyptic number.

40172421655 is a deficient number, since it is larger than the sum of its proper divisors (8036382329).

40172421655 is a wasteful number, since it uses less digits than its factorization.

40172421655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316337.

The product of its (nonzero) digits is 67200, while the sum is 37.

Adding to 40172421655 its reverse (55612427104), we get a palindrome (95784848759).

The spelling of 40172421655 in words is "forty billion, one hundred seventy-two million, four hundred twenty-one thousand, six hundred fifty-five".