51665981362 has 8 divisors (see below), whose sum is σ = 78184803996. Its totient is φ = 25604380032.

The previous prime is 51665981359. The next prime is 51665981383. The reversal of 51665981362 is 26318956615.

It can be written as a sum of positive squares in 2 ways, for example, as 44676854161 + 6989127201 = 211369^2 + 83601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114305043 + ... + 114305494.

Almost surely, 2^51665981362 is an apocalyptic number.

51665981362 is a deficient number, since it is larger than the sum of its proper divisors (26518822634).

51665981362 is a wasteful number, since it uses less digits than its factorization.

51665981362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228610652.

The product of its digits is 2332800, while the sum is 52.

The spelling of 51665981362 in words is "fifty-one billion, six hundred sixty-five million, nine hundred eighty-one thousand, three hundred sixty-two".