216440145644 has 12 divisors (see below), whose sum is σ = 378782474784. Its totient is φ = 108216581424.

The previous prime is 216440145629. The next prime is 216440145689. The reversal of 216440145644 is 446541044612.

216440145644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730799 + ... + 983334.

It is an arithmetic number, because the mean of its divisors is an integer number (31565206232).

Almost surely, 2^216440145644 is an apocalyptic number.

It is an amenable number.

216440145644 is a deficient number, since it is larger than the sum of its proper divisors (162342329140).

216440145644 is a wasteful number, since it uses less digits than its factorization.

216440145644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745704 (or 1745702 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 41.

The spelling of 216440145644 in words is "two hundred sixteen billion, four hundred forty million, one hundred forty-five thousand, six hundred forty-four".