61632223640 has 128 divisors (see below), whose sum is σ = 160805736000. Its totient is φ = 21054701568.

The previous prime is 61632223621. The next prime is 61632223649. The reversal of 61632223640 is 4632223616.

It is a self number, because there is not a number n which added to its sum of digits gives 61632223640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61632223649) 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, 462476 + ... + 580644.

Almost surely, 2^61632223640 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 61632223640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80402868000).

61632223640 is an abundant number, since it is smaller than the sum of its proper divisors (99173512360).

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

61632223640 is a wasteful number, since it uses less digits than its factorization.

61632223640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118269 (or 118265 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 61632223640 in words is "sixty-one billion, six hundred thirty-two million, two hundred twenty-three thousand, six hundred forty".