675653621 has 2 divisors, whose sum is σ = 675653622. Its totient is φ = 675653620.

The previous prime is 675653611. The next prime is 675653669. The reversal of 675653621 is 126356576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639533521 + 36120100 = 25289^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 675653621 - 2¹⁸ = 675391477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (675653611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337826810 + 337826811.

It is an arithmetic number, because the mean of its divisors is an integer number (337826811).

Almost surely, 2^675653621 is an apocalyptic number.

It is an amenable number.

675653621 is a deficient number, since it is larger than the sum of its proper divisors (1).

675653621 is an equidigital number, since it uses as much as digits as its factorization.

675653621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 675653621 is about 25993.3380118830. The cubic root of 675653621 is about 877.4883707736.

The spelling of 675653621 in words is "six hundred seventy-five million, six hundred fifty-three thousand, six hundred twenty-one".