216451555047 has 128 divisors (see below), whose sum is σ = 399187712000. Its totient is φ = 112870195200.

The previous prime is 216451555027. The next prime is 216451555051. The reversal of 216451555047 is 740555154612.

216451555047 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 51 + 5 + 550 + 47 = 666.

It is not a de Polignac number, because 216451555047 - 2¹⁰ = 216451554023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216451554993 and 216451555011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216451555007) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 205947672 + ... + 205948722.

It is an arithmetic number, because the mean of its divisors is an integer number (3118654000).

Almost surely, 2^216451555047 is an apocalyptic number.

216451555047 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216451555047 is a deficient number, since it is larger than the sum of its proper divisors (182736156953).

216451555047 is a wasteful number, since it uses less digits than its factorization.

216451555047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The spelling of 216451555047 in words is "two hundred sixteen billion, four hundred fifty-one million, five hundred fifty-five thousand, forty-seven".