51381356564603 has 8 divisors (see below), whose sum is σ = 55756163790096. Its totient is φ = 47066891508000.

The previous prime is 51381356564599. The next prime is 51381356564621. The reversal of 51381356564603 is 30646565318315.

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

It is not a de Polignac number, because 51381356564603 - 2² = 51381356564599 is a prime.

It is a super-2 number, since 2×51381356564603² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51381356564653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15085540448 + ... + 15085543853.

It is an arithmetic number, because the mean of its divisors is an integer number (6969520473762).

Almost surely, 2^{51381356564603} is an apocalyptic number.

51381356564603 is a deficient number, since it is larger than the sum of its proper divisors (4374807225493).

51381356564603 is a wasteful number, since it uses less digits than its factorization.

51381356564603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30171084445.

The product of its (nonzero) digits is 23328000, while the sum is 56.

The spelling of 51381356564603 in words is "fifty-one trillion, three hundred eighty-one billion, three hundred fifty-six million, five hundred sixty-four thousand, six hundred three".