51455524640066 has 4 divisors (see below), whose sum is σ = 77183286960102. Its totient is φ = 25727762320032.

The previous prime is 51455524640041. The next prime is 51455524640119. The reversal of 51455524640066 is 66004642555415.

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., 45246811230625 + 6208713409441 = 6726575^2 + 2491729^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12863881160015 + ... + 12863881160018.

Almost surely, 2^{51455524640066} is an apocalyptic number.

51455524640066 is a deficient number, since it is larger than the sum of its proper divisors (25727762320036).

51455524640066 is a wasteful number, since it uses less digits than its factorization.

51455524640066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25727762320035.

The product of its (nonzero) digits is 17280000, while the sum is 53.

The spelling of 51455524640066 in words is "fifty-one trillion, four hundred fifty-five billion, five hundred twenty-four million, six hundred forty thousand, sixty-six".