3561980856 has 128 divisors (see below), whose sum is σ = 10340628480. Its totient is φ = 1001460096.

The previous prime is 3561980843. The next prime is 3561980867. The reversal of 3561980856 is 6580891653.

3561980856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3561980799 and 3561980808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6511575 + ... + 6512121.

It is an arithmetic number, because the mean of its divisors is an integer number (80786160).

Almost surely, 2^3561980856 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 3561980856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5170314240).

3561980856 is an abundant number, since it is smaller than the sum of its proper divisors (6778647624).

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

3561980856 is a wasteful number, since it uses less digits than its factorization.

3561980856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 51.

The square root of 3561980856 is about 59682.3328632519. The cubic root of 3561980856 is about 1527.2044950939.

The spelling of 3561980856 in words is "three billion, five hundred sixty-one million, nine hundred eighty thousand, eight hundred fifty-six".