51551551666505 has 32 divisors (see below), whose sum is σ = 71039112393600. Its totient is φ = 35517988684800.

The previous prime is 51551551666487. The next prime is 51551551666513. The reversal of 51551551666505 is 50566615515515.

It is not a de Polignac number, because 51551551666505 - 2¹² = 51551551662409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48992561 + ... + 50033729.

It is an arithmetic number, because the mean of its divisors is an integer number (2219972262300).

Almost surely, 2^{51551551666505} is an apocalyptic number.

51551551666505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51551551666505 is a deficient number, since it is larger than the sum of its proper divisors (19487560727095).

51551551666505 is a wasteful number, since it uses less digits than its factorization.

51551551666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088585.

The product of its (nonzero) digits is 16875000, while the sum is 56.

The spelling of 51551551666505 in words is "fifty-one trillion, five hundred fifty-one billion, five hundred fifty-one million, six hundred sixty-six thousand, five hundred five".