51860411986 has 4 divisors (see below), whose sum is σ = 77790617982. Its totient is φ = 25930205992.

The previous prime is 51860411909. The next prime is 51860411989. The reversal of 51860411986 is 68911406815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 33569201961 + 18291210025 = 183219^2 + 135245^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51860411989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12965102995 + ... + 12965102998.

Almost surely, 2^51860411986 is an apocalyptic number.

51860411986 is a deficient number, since it is larger than the sum of its proper divisors (25930205996).

51860411986 is a wasteful number, since it uses less digits than its factorization.

51860411986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25930205995.

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 51860411986 in words is "fifty-one billion, eight hundred sixty million, four hundred eleven thousand, nine hundred eighty-six".