551011220501 has 64 divisors (see below), whose sum is σ = 694624896000. Its totient is φ = 435767270400.

The previous prime is 551011220453. The next prime is 551011220521. The reversal of 551011220501 is 105022110155.

It is not a de Polignac number, because 551011220501 - 2⁶ = 551011220437 is a prime.

It is a super-2 number, since 2×551011220501² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551011220521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28777391 + ... + 28796531.

It is an arithmetic number, because the mean of its divisors is an integer number (10853514000).

Almost surely, 2^551011220501 is an apocalyptic number.

It is an amenable number.

551011220501 is a deficient number, since it is larger than the sum of its proper divisors (143613675499).

551011220501 is a wasteful number, since it uses less digits than its factorization.

551011220501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19315 (or 19301 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 23.

Adding to 551011220501 its reverse (105022110155), we get a palindrome (656033330656).

The spelling of 551011220501 in words is "five hundred fifty-one billion, eleven million, two hundred twenty thousand, five hundred one".