207216477 has 18 divisors (see below), whose sum is σ = 324110202. Its totient is φ = 127516896.

The previous prime is 207216469. The next prime is 207216481. The reversal of 207216477 is 774612702.

It is a happy number.

207216477 is a `hidden beast` number, since 2 + 0 + 7 + 2 + 1 + 647 + 7 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 29241 + 207187236 = 171^2 + 14394^2 .

It is not a de Polignac number, because 207216477 - 2³ = 207216469 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207216487) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 66598 + ... + 69639.

Almost surely, 2^207216477 is an apocalyptic number.

It is an amenable number.

207216477 is a deficient number, since it is larger than the sum of its proper divisors (116893725).

207216477 is a wasteful number, since it uses less digits than its factorization.

207216477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136269 (or 136253 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 207216477 is about 14395.0156998872. The cubic root of 207216477 is about 591.7543083909.

The spelling of 207216477 in words is "two hundred seven million, two hundred sixteen thousand, four hundred seventy-seven".