45117281856 has 56 divisors (see below), whose sum is σ = 119406395680. Its totient is φ = 15034862592.

The previous prime is 45117281851. The next prime is 45117281879. The reversal of 45117281856 is 65818271154.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (45117281851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692475 + ... + 754821.

Almost surely, 2^45117281856 is an apocalyptic number.

It is an amenable number.

45117281856 is an abundant number, since it is smaller than the sum of its proper divisors (74289113824).

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

45117281856 is a wasteful number, since it uses less digits than its factorization.

45117281856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66131 (or 66121 counting only the distinct ones).

The product of its digits is 537600, while the sum is 48.

It can be divided in two parts, 451172 and 81856, that added together give a triangular number (533028 = T₁₀₃₂).

The spelling of 45117281856 in words is "forty-five billion, one hundred seventeen million, two hundred eighty-one thousand, eight hundred fifty-six".