51581211477 has 8 divisors (see below), whose sum is σ = 69230412480. Its totient is φ = 34159742400.

The previous prime is 51581211469. The next prime is 51581211523. The reversal of 51581211477 is 77411218515.

It is a happy number.

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

It is not a de Polignac number, because 51581211477 - 2³ = 51581211469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51581211977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56932452 + ... + 56933357.

It is an arithmetic number, because the mean of its divisors is an integer number (8653801560).

Almost surely, 2^51581211477 is an apocalyptic number.

It is an amenable number.

51581211477 is a deficient number, since it is larger than the sum of its proper divisors (17649201003).

51581211477 is a wasteful number, since it uses less digits than its factorization.

51581211477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113865963.

The product of its digits is 78400, while the sum is 42.

The spelling of 51581211477 in words is "fifty-one billion, five hundred eighty-one million, two hundred eleven thousand, four hundred seventy-seven".