551121251720 has 128 divisors (see below), whose sum is σ = 1417001040000. Its totient is φ = 191109328896.

The previous prime is 551121251689. The next prime is 551121251729. The reversal of 551121251720 is 27152121155.

It is not an unprimeable number, because it can be changed into a prime (551121251729) 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, 4061531 + ... + 4195029.

It is an arithmetic number, because the mean of its divisors is an integer number (11070320625).

Almost surely, 2^551121251720 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 551121251720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708500520000).

551121251720 is an abundant number, since it is smaller than the sum of its proper divisors (865879788280).

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

551121251720 is a wasteful number, since it uses less digits than its factorization.

551121251720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134007 (or 134003 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 32.

Adding to 551121251720 its reverse (27152121155), we get a palindrome (578273372875).

The spelling of 551121251720 in words is "five hundred fifty-one billion, one hundred twenty-one million, two hundred fifty-one thousand, seven hundred twenty".