661110701 has 2 divisors, whose sum is σ = 661110702. Its totient is φ = 661110700.

The previous prime is 661110673. The next prime is 661110707. The reversal of 661110701 is 107011166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 603881476 + 57229225 = 24574^2 + 7565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661110701 is a prime.

It is a super-2 number, since 2×661110701² = 874134717953422802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661110707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330555350 + 330555351.

It is an arithmetic number, because the mean of its divisors is an integer number (330555351).

Almost surely, 2^661110701 is an apocalyptic number.

It is an amenable number.

661110701 is a deficient number, since it is larger than the sum of its proper divisors (1).

661110701 is an equidigital number, since it uses as much as digits as its factorization.

661110701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 661110701 is about 25712.0730591681. The cubic root of 661110701 is about 871.1469002287.

Adding to 661110701 its reverse (107011166), we get a palindrome (768121867).

The spelling of 661110701 in words is "six hundred sixty-one million, one hundred ten thousand, seven hundred one".