1631206656 has 108 divisors (see below), whose sum is σ = 4773819232. Its totient is φ = 535569408.

The previous prime is 1631206651. The next prime is 1631206663. The reversal of 1631206656 is 6566021361.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1631206656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631206651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149085 + ... + 159651.

Almost surely, 2^1631206656 is an apocalyptic number.

1631206656 is a gapful number since it is divisible by the number (16) 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 1631206656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386909616).

1631206656 is an abundant number, since it is smaller than the sum of its proper divisors (3142612576).

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

1631206656 is a wasteful number, since it uses less digits than its factorization.

1631206656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656 (or 10639 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1631206656 is about 40388.1994646951. The cubic root of 1631206656 is about 1177.1622550879.

The spelling of 1631206656 in words is "one billion, six hundred thirty-one million, two hundred six thousand, six hundred fifty-six".