617720827541 has 2 divisors, whose sum is σ = 617720827542. Its totient is φ = 617720827540.

The previous prime is 617720827511. The next prime is 617720827561. The reversal of 617720827541 is 145728027716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451355548900 + 166365278641 = 671830^2 + 407879^2 .

It is a cyclic number.

It is not a de Polignac number, because 617720827541 - 2¹⁴ = 617720811157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 617720827541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617720827511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308860413770 + 308860413771.

It is an arithmetic number, because the mean of its divisors is an integer number (308860413771).

Almost surely, 2^617720827541 is an apocalyptic number.

It is an amenable number.

617720827541 is a deficient number, since it is larger than the sum of its proper divisors (1).

617720827541 is an equidigital number, since it uses as much as digits as its factorization.

617720827541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 617720827541 in words is "six hundred seventeen billion, seven hundred twenty million, eight hundred twenty-seven thousand, five hundred forty-one".