51651066516101 has 4 divisors (see below), whose sum is σ = 55624225478892. Its totient is φ = 47677907553312.

The previous prime is 51651066516059. The next prime is 51651066516139. The reversal of 51651066516101 is 10161566015615.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7483425292225 + 44167641223876 = 2735585^2 + 6645874^2 .

It is a cyclic number.

It is not a de Polignac number, because 51651066516101 - 2¹⁰ = 51651066515077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651066816101) 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, 1986579481376 + ... + 1986579481401.

It is an arithmetic number, because the mean of its divisors is an integer number (13906056369723).

Almost surely, 2^{51651066516101} is an apocalyptic number.

It is an amenable number.

51651066516101 is a deficient number, since it is larger than the sum of its proper divisors (3973158962791).

51651066516101 is a wasteful number, since it uses less digits than its factorization.

51651066516101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973158962790.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 51651066516101 in words is "fifty-one trillion, six hundred fifty-one billion, sixty-six million, five hundred sixteen thousand, one hundred one".