66315797 has 2 divisors, whose sum is σ = 66315798. Its totient is φ = 66315796.

The previous prime is 66315787. The next prime is 66315841. The reversal of 66315797 is 79751366.

It is an a-pointer prime, because the next prime (66315841) can be obtained adding 66315797 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44702596 + 21613201 = 6686^2 + 4649^2 .

It is a cyclic number.

It is not a de Polignac number, because 66315797 - 2¹² = 66311701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66315707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157898 + 33157899.

It is an arithmetic number, because the mean of its divisors is an integer number (33157899).

Almost surely, 2^66315797 is an apocalyptic number.

It is an amenable number.

66315797 is a deficient number, since it is larger than the sum of its proper divisors (1).

66315797 is an equidigital number, since it uses as much as digits as its factorization.

66315797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 66315797 is about 8143.4511725681. The cubic root of 66315797 is about 404.7675280192.

The spelling of 66315797 in words is "sixty-six million, three hundred fifteen thousand, seven hundred ninety-seven".