51505511501606 has 4 divisors (see below), whose sum is σ = 77258267252412. Its totient is φ = 25752755750802.

The previous prime is 51505511501573. The next prime is 51505511501627. The reversal of 51505511501606 is 60610511550515.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12876377875400 + ... + 12876377875403.

It is an arithmetic number, because the mean of its divisors is an integer number (19314566813103).

Almost surely, 2^{51505511501606} is an apocalyptic number.

51505511501606 is a deficient number, since it is larger than the sum of its proper divisors (25752755750806).

51505511501606 is a wasteful number, since it uses less digits than its factorization.

51505511501606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25752755750805.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 51505511501606 in words is "fifty-one trillion, five hundred five billion, five hundred eleven million, five hundred one thousand, six hundred six".