63211977738 has 144 divisors (see below), whose sum is σ = 171747628416. Its totient is φ = 16654559040.

The previous prime is 63211977737. The next prime is 63211977739. The reversal of 63211977738 is 83777911236.

It is an interprime number because it is at equal distance from previous prime (63211977737) and next prime (63211977739).

It is not an unprimeable number, because it can be changed into a prime (63211977737) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14938083 + ... + 14942313.

It is an arithmetic number, because the mean of its divisors is an integer number (1192691864).

Almost surely, 2^63211977738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63211977738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85873814208).

63211977738 is an abundant number, since it is smaller than the sum of its proper divisors (108535650678).

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

63211977738 is a wasteful number, since it uses less digits than its factorization.

63211977738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569 (or 5559 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 63211977738 in words is "sixty-three billion, two hundred eleven million, nine hundred seventy-seven thousand, seven hundred thirty-eight".