51664241101020 has 96 divisors (see below), whose sum is σ = 146714697432576. Its totient is φ = 13581479520000.

The previous prime is 51664241101009. The next prime is 51664241101027. The reversal of 51664241101020 is 2010114246615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51664241101027) 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, 35500947 + ... + 36927573.

It is an arithmetic number, because the mean of its divisors is an integer number (1528278098256).

Almost surely, 2^{51664241101020} 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 51664241101020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73357348716288).

51664241101020 is an abundant number, since it is smaller than the sum of its proper divisors (95050456331556).

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

51664241101020 is a wasteful number, since it uses less digits than its factorization.

51664241101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435211 (or 1435209 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

Adding to 51664241101020 its reverse (2010114246615), we get a palindrome (53674355347635).

The spelling of 51664241101020 in words is "fifty-one trillion, six hundred sixty-four billion, two hundred forty-one million, one hundred one thousand, twenty".