51170721607 has 2 divisors, whose sum is σ = 51170721608. Its totient is φ = 51170721606.

The previous prime is 51170721577. The next prime is 51170721617. The reversal of 51170721607 is 70612707115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51170721607 - 2¹⁵ = 51170688839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51170721617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585360803 + 25585360804.

It is an arithmetic number, because the mean of its divisors is an integer number (25585360804).

Almost surely, 2^51170721607 is an apocalyptic number.

51170721607 is a deficient number, since it is larger than the sum of its proper divisors (1).

51170721607 is an equidigital number, since it uses as much as digits as its factorization.

51170721607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20580, while the sum is 37.

The spelling of 51170721607 in words is "fifty-one billion, one hundred seventy million, seven hundred twenty-one thousand, six hundred seven".