51329962018 has 4 divisors (see below), whose sum is σ = 76994943030. Its totient is φ = 25664981008.

The previous prime is 51329961979. The next prime is 51329962043. The reversal of 51329962018 is 81026992315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81026992315 = 5 ⋅16205398463.

It can be written as a sum of positive squares in only one way, i.e., 49114094689 + 2215867329 = 221617^2 + 47073^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832490503 + ... + 12832490506.

Almost surely, 2^51329962018 is an apocalyptic number.

51329962018 is a deficient number, since it is larger than the sum of its proper divisors (25664981012).

51329962018 is a wasteful number, since it uses less digits than its factorization.

51329962018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25664981011.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 51329962018 in words is "fifty-one billion, three hundred twenty-nine million, nine hundred sixty-two thousand, eighteen".