50421166551 has 48 divisors (see below), whose sum is σ = 87414324480. Its totient is φ = 28639442160.

The previous prime is 50421166517. The next prime is 50421166573. The reversal of 50421166551 is 15566112405.

50421166551 is a `hidden beast` number, since 5 + 0 + 42 + 1 + 1 + 66 + 551 = 666.

It is not a de Polignac number, because 50421166551 - 2⁶ = 50421166487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50421166151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106836 + ... + 335046.

It is an arithmetic number, because the mean of its divisors is an integer number (1821131760).

Almost surely, 2^50421166551 is an apocalyptic number.

50421166551 is a deficient number, since it is larger than the sum of its proper divisors (36993157929).

50421166551 is a wasteful number, since it uses less digits than its factorization.

50421166551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228401 (or 228388 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 50421166551 its reverse (15566112405), we get a palindrome (65987278956).

The spelling of 50421166551 in words is "fifty billion, four hundred twenty-one million, one hundred sixty-six thousand, five hundred fifty-one".