75920781617 has 2 divisors, whose sum is σ = 75920781618. Its totient is φ = 75920781616.

The previous prime is 75920781569. The next prime is 75920781619. The reversal of 75920781617 is 71618702957.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75796146721 + 124634896 = 275311^2 + 11164^2 .

It is a cyclic number.

It is not a de Polignac number, because 75920781617 - 2³⁰ = 74847039793 is a prime.

Together with 75920781619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75920781619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37960390808 + 37960390809.

It is an arithmetic number, because the mean of its divisors is an integer number (37960390809).

Almost surely, 2^75920781617 is an apocalyptic number.

It is an amenable number.

75920781617 is a deficient number, since it is larger than the sum of its proper divisors (1).

75920781617 is an equidigital number, since it uses as much as digits as its factorization.

75920781617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 75920781617 in words is "seventy-five billion, nine hundred twenty million, seven hundred eighty-one thousand, six hundred seventeen".