51105542216 has 8 divisors (see below), whose sum is σ = 95822891670. Its totient is φ = 25552771104.

The previous prime is 51105542209. The next prime is 51105542219. The reversal of 51105542216 is 61224550115.

It can be written as a sum of positive squares in only one way, i.e., 38866545316 + 12238996900 = 197146^2 + 110630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×51105542216² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51105542219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3194096381 + ... + 3194096396.

Almost surely, 2^51105542216 is an apocalyptic number.

It is an amenable number.

51105542216 is a deficient number, since it is larger than the sum of its proper divisors (44717349454).

51105542216 is a wasteful number, since it uses less digits than its factorization.

51105542216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6388192783 (or 6388192779 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 51105542216 in words is "fifty-one billion, one hundred five million, five hundred forty-two thousand, two hundred sixteen".