551151544021 has 4 divisors (see below), whose sum is σ = 593547816652. Its totient is φ = 508755271392.

The previous prime is 551151544001. The next prime is 551151544063. The reversal of 551151544021 is 120445151155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34442163396 + 516709380625 = 185586^2 + 718825^2 .

It is a cyclic number.

It is not a de Polignac number, because 551151544021 - 2⁷ = 551151543893 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 (551151544001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21198136296 + ... + 21198136321.

It is an arithmetic number, because the mean of its divisors is an integer number (148386954163).

Almost surely, 2^551151544021 is an apocalyptic number.

It is an amenable number.

551151544021 is a deficient number, since it is larger than the sum of its proper divisors (42396272631).

551151544021 is a wasteful number, since it uses less digits than its factorization.

551151544021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42396272630.

The product of its (nonzero) digits is 20000, while the sum is 34.

Adding to 551151544021 its reverse (120445151155), we get a palindrome (671596695176).

The spelling of 551151544021 in words is "five hundred fifty-one billion, one hundred fifty-one million, five hundred forty-four thousand, twenty-one".