51549156771 has 16 divisors (see below), whose sum is σ = 78574220544. Its totient is φ = 29447989344.

The previous prime is 51549156767. The next prime is 51549156773. The reversal of 51549156771 is 17765194515.

It is not a de Polignac number, because 51549156771 - 2² = 51549156767 is a prime.

It is a super-2 number, since 2×51549156771² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51549156773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287941 + ... + 431286.

It is an arithmetic number, because the mean of its divisors is an integer number (4910888784).

Almost surely, 2^51549156771 is an apocalyptic number.

51549156771 is a deficient number, since it is larger than the sum of its proper divisors (27025063773).

51549156771 is a wasteful number, since it uses less digits than its factorization.

51549156771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722650.

The product of its digits is 1323000, while the sum is 51.

The spelling of 51549156771 in words is "fifty-one billion, five hundred forty-nine million, one hundred fifty-six thousand, seven hundred seventy-one".