51606213544 has 16 divisors (see below), whose sum is σ = 97848861300. Its totient is φ = 25513183872.

The previous prime is 51606213541. The next prime is 51606213553. The reversal of 51606213544 is 44531260615.

It can be written as a sum of positive squares in 2 ways, for example, as 51370222500 + 235991044 = 226650^2 + 15362^2 .

It is a super-3 number, since 3×51606213544³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51606213541) 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, 36239607 + ... + 36241030.

Almost surely, 2^51606213544 is an apocalyptic number.

It is an amenable number.

51606213544 is a deficient number, since it is larger than the sum of its proper divisors (46242647756).

51606213544 is a wasteful number, since it uses less digits than its factorization.

51606213544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72480732 (or 72480728 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 51606213544 in words is "fifty-one billion, six hundred six million, two hundred thirteen thousand, five hundred forty-four".