671155501263553 has 2 divisors, whose sum is σ = 671155501263554. Its totient is φ = 671155501263552.

The previous prime is 671155501263427. The next prime is 671155501263613. The reversal of 671155501263553 is 355362105551176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568365244329744 + 102790256933809 = 23840412^2 + 10138553^2 .

It is a cyclic number.

It is not a de Polignac number, because 671155501263553 - 2³³ = 671146911328961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671155501263494 and 671155501263503.

It is not a weakly prime, because it can be changed into another prime (671155501263253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335577750631776 + 335577750631777.

It is an arithmetic number, because the mean of its divisors is an integer number (335577750631777).

Almost surely, 2^{671155501263553} is an apocalyptic number.

It is an amenable number.

671155501263553 is a deficient number, since it is larger than the sum of its proper divisors (1).

671155501263553 is an equidigital number, since it uses as much as digits as its factorization.

671155501263553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14175000, while the sum is 55.

The spelling of 671155501263553 in words is "six hundred seventy-one trillion, one hundred fifty-five billion, five hundred one million, two hundred sixty-three thousand, five hundred fifty-three".