662197561 has 2 divisors, whose sum is σ = 662197562. Its totient is φ = 662197560.

The previous prime is 662197537. The next prime is 662197597. The reversal of 662197561 is 165791266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651015225 + 11182336 = 25515^2 + 3344^2 .

It is a cyclic number.

It is not a de Polignac number, because 662197561 - 2²¹ = 660100409 is a prime.

It is not a weakly prime, because it can be changed into another prime (662197961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331098780 + 331098781.

It is an arithmetic number, because the mean of its divisors is an integer number (331098781).

Almost surely, 2^662197561 is an apocalyptic number.

It is an amenable number.

662197561 is a deficient number, since it is larger than the sum of its proper divisors (1).

662197561 is an equidigital number, since it uses as much as digits as its factorization.

662197561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 662197561 is about 25733.1995873036. The cubic root of 662197561 is about 871.6240247306.

The spelling of 662197561 in words is "six hundred sixty-two million, one hundred ninety-seven thousand, five hundred sixty-one".