551857739421 has 8 divisors (see below), whose sum is σ = 736070058880. Its totient is φ = 367775289792.

The previous prime is 551857739399. The next prime is 551857739479. The reversal of 551857739421 is 124937758155.

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

It is not a de Polignac number, because 551857739421 - 2⁶ = 551857739357 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 (551857739921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32457541 + ... + 32474538.

It is an arithmetic number, because the mean of its divisors is an integer number (92008757360).

Almost surely, 2^551857739421 is an apocalyptic number.

It is an amenable number.

551857739421 is a deficient number, since it is larger than the sum of its proper divisors (184212319459).

551857739421 is a wasteful number, since it uses less digits than its factorization.

551857739421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64934915.

The product of its digits is 10584000, while the sum is 57.

The spelling of 551857739421 in words is "five hundred fifty-one billion, eight hundred fifty-seven million, seven hundred thirty-nine thousand, four hundred twenty-one".