216374777472 has 128 divisors (see below), whose sum is σ = 661037063040. Its totient is φ = 61427478528.

The previous prime is 216374777453. The next prime is 216374777503. The reversal of 216374777472 is 274777473612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a nude number because it is divisible by every one of its digits.

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, 165658 + ... + 678374.

It is an arithmetic number, because the mean of its divisors is an integer number (5164352055).

Almost surely, 2^216374777472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216374777472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330518531520).

216374777472 is an abundant number, since it is smaller than the sum of its proper divisors (444662285568).

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

216374777472 is a wasteful number, since it uses less digits than its factorization.

216374777472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512898 (or 512886 counting only the distinct ones).

The product of its digits is 19361664, while the sum is 57.

The spelling of 216374777472 in words is "two hundred sixteen billion, three hundred seventy-four million, seven hundred seventy-seven thousand, four hundred seventy-two".