216670815654 has 32 divisors (see below), whose sum is σ = 450934957440. Its totient is φ = 69348320832.

The previous prime is 216670815637. The next prime is 216670815707. The reversal of 216670815654 is 456518076612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 216670815597 and 216670815606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7101807 + ... + 7132250.

It is an arithmetic number, because the mean of its divisors is an integer number (14091717420).

Almost surely, 2^216670815654 is an apocalyptic number.

216670815654 is an abundant number, since it is smaller than the sum of its proper divisors (234264141786).

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

216670815654 is a wasteful number, since it uses less digits than its factorization.

216670815654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14234164.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 216670815654 in words is "two hundred sixteen billion, six hundred seventy million, eight hundred fifteen thousand, six hundred fifty-four".