216157707 has 8 divisors (see below), whose sum is σ = 320233680. Its totient is φ = 144105120.

The previous prime is 216157693. The next prime is 216157717. The reversal of 216157707 is 707751612.

216157707 is a `hidden beast` number, since 21 + 61 + 577 + 0 + 7 = 666.

It is not a de Polignac number, because 216157707 - 2²⁰ = 215109131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216157717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4002894 + ... + 4002947.

It is an arithmetic number, because the mean of its divisors is an integer number (40029210).

Almost surely, 2^216157707 is an apocalyptic number.

216157707 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216157707 is a deficient number, since it is larger than the sum of its proper divisors (104075973).

216157707 is an equidigital number, since it uses as much as digits as its factorization.

216157707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8005850 (or 8005844 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 36.

The square root of 216157707 is about 14702.3027788167. The cubic root of 216157707 is about 600.1459894756.

The spelling of 216157707 in words is "two hundred sixteen million, one hundred fifty-seven thousand, seven hundred seven".