3178216656 has 160 divisors (see below), whose sum is σ = 9376542720. Its totient is φ = 1030288896.

The previous prime is 3178216651. The next prime is 3178216663. The reversal of 3178216656 is 6566128713.

It is a super-2 number, since 2×3178216656² = 20202122224951644672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3178216651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2907246 + ... + 2908338.

It is an arithmetic number, because the mean of its divisors is an integer number (58603392).

Almost surely, 2^3178216656 is an apocalyptic number.

3178216656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3178216656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4688271360).

3178216656 is an abundant number, since it is smaller than the sum of its proper divisors (6198326064).

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

3178216656 is a wasteful number, since it uses less digits than its factorization.

3178216656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1278 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 3178216656 is about 56375.6743285613. The cubic root of 3178216656 is about 1470.2612113906.

The spelling of 3178216656 in words is "three billion, one hundred seventy-eight million, two hundred sixteen thousand, six hundred fifty-six".