551440020311 has 8 divisors (see below), whose sum is σ = 581347796064. Its totient is φ = 522026588160.

The previous prime is 551440020293. The next prime is 551440020347. The reversal of 551440020311 is 113020044155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551440020311 - 2²⁶ = 551372911447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551440020611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123583610 + ... + 123588071.

It is an arithmetic number, because the mean of its divisors is an integer number (72668474508).

Almost surely, 2^551440020311 is an apocalyptic number.

551440020311 is a deficient number, since it is larger than the sum of its proper divisors (29907775753).

551440020311 is a wasteful number, since it uses less digits than its factorization.

551440020311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247171801.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 551440020311 its reverse (113020044155), we get a palindrome (664460064466).

The spelling of 551440020311 in words is "five hundred fifty-one billion, four hundred forty million, twenty thousand, three hundred eleven".