51400297771 has 4 divisors (see below), whose sum is σ = 51441851392. Its totient is φ = 51358744152.

The previous prime is 51400297763. The next prime is 51400297783. The reversal of 51400297771 is 17779200415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17779200415 = 5 ⋅3555840083.

It is a cyclic number.

It is not a de Polignac number, because 51400297771 - 2³ = 51400297763 is a prime.

It is a super-2 number, since 2×51400297771² (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 (51400297721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20774955 + ... + 20777428.

It is an arithmetic number, because the mean of its divisors is an integer number (12860462848).

Almost surely, 2^51400297771 is an apocalyptic number.

51400297771 is a deficient number, since it is larger than the sum of its proper divisors (41553621).

51400297771 is a wasteful number, since it uses less digits than its factorization.

51400297771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41553620.

The product of its (nonzero) digits is 123480, while the sum is 43.

The spelling of 51400297771 in words is "fifty-one billion, four hundred million, two hundred ninety-seven thousand, seven hundred seventy-one".