51663261020603 has 4 divisors (see below), whose sum is σ = 51667198482168. Its totient is φ = 51659323559040.

The previous prime is 51663261020573. The next prime is 51663261020671. The reversal of 51663261020603 is 30602016236615.

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

It is a cyclic number.

It is not a de Polignac number, because 51663261020603 - 2¹⁶ = 51663260955067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51663261020303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968711101 + ... + 1968737342.

It is an arithmetic number, because the mean of its divisors is an integer number (12916799620542).

Almost surely, 2^{51663261020603} is an apocalyptic number.

51663261020603 is a deficient number, since it is larger than the sum of its proper divisors (3937461565).

51663261020603 is a wasteful number, since it uses less digits than its factorization.

51663261020603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937461564.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 51663261020603 in words is "fifty-one trillion, six hundred sixty-three billion, two hundred sixty-one million, twenty thousand, six hundred three".