51911065601 has 4 divisors (see below), whose sum is σ = 53314067412. Its totient is φ = 50508063792.

The previous prime is 51911065597. The next prime is 51911065627. The reversal of 51911065601 is 10656011915.

It is a Cunningham number, because it is equal to 227840²+1.

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 46450594576 + 5460471025 = 215524^2 + 73895^2 .

It is a cyclic number.

It is not a de Polignac number, because 51911065601 - 2² = 51911065597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51911065691) 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, 701500850 + ... + 701500923.

It is an arithmetic number, because the mean of its divisors is an integer number (13328516853).

It is a Proth number, since it is equal to 198025 ⋅ 2¹⁸ + 1 and 198025 < 2¹⁸.

Almost surely, 2^51911065601 is an apocalyptic number.

It is an amenable number.

51911065601 is a deficient number, since it is larger than the sum of its proper divisors (1403001811).

51911065601 is a wasteful number, since it uses less digits than its factorization.

51911065601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403001810.

The product of its (nonzero) digits is 8100, while the sum is 35.

The spelling of 51911065601 in words is "fifty-one billion, nine hundred eleven million, sixty-five thousand, six hundred one".