51051221747 has 8 divisors (see below), whose sum is σ = 52017804720. Its totient is φ = 50084763040.

The previous prime is 51051221513. The next prime is 51051221783. The reversal of 51051221747 is 74712215015.

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 51051221747 - 2¹⁰ = 51051220723 is a prime.

It is a super-2 number, since 2×51051221747² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51051221147) 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, 1602797 + ... + 1634337.

It is an arithmetic number, because the mean of its divisors is an integer number (6502225590).

Almost surely, 2^51051221747 is an apocalyptic number.

51051221747 is a deficient number, since it is larger than the sum of its proper divisors (966582973).

51051221747 is a wasteful number, since it uses less digits than its factorization.

51051221747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62133.

The product of its (nonzero) digits is 19600, while the sum is 35.

The spelling of 51051221747 in words is "fifty-one billion, fifty-one million, two hundred twenty-one thousand, seven hundred forty-seven".