216156377 has 4 divisors (see below), whose sum is σ = 228871476. Its totient is φ = 203441280.

The previous prime is 216156361. The next prime is 216156379. The reversal of 216156377 is 773651612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 188897536 + 27258841 = 13744^2 + 5221^2 .

It is a cyclic number.

It is not a de Polignac number, because 216156377 - 2⁴ = 216156361 is a prime.

It is a super-2 number, since 2×216156377² = 93447158635532258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216156377.

It is not an unprimeable number, because it can be changed into a prime (216156379) 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 3 ways as a sum of consecutive naturals, for example, 6357524 + ... + 6357557.

It is an arithmetic number, because the mean of its divisors is an integer number (57217869).

Almost surely, 2^216156377 is an apocalyptic number.

It is an amenable number.

216156377 is a deficient number, since it is larger than the sum of its proper divisors (12715099).

216156377 is a wasteful number, since it uses less digits than its factorization.

216156377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12715098.

The product of its digits is 52920, while the sum is 38.

The square root of 216156377 is about 14702.2575477374. The cubic root of 216156377 is about 600.1447585906.

The spelling of 216156377 in words is "two hundred sixteen million, one hundred fifty-six thousand, three hundred seventy-seven".