660436992121 has 2 divisors, whose sum is σ = 660436992122. Its totient is φ = 660436992120.

The previous prime is 660436992101. The next prime is 660436992191. The reversal of 660436992121 is 121299634066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513142995600 + 147293996521 = 716340^2 + 383789^2 .

It is a cyclic number.

It is not a de Polignac number, because 660436992121 - 2²¹ = 660434894969 is a prime.

It is not a weakly prime, because it can be changed into another prime (660436992101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330218496060 + 330218496061.

It is an arithmetic number, because the mean of its divisors is an integer number (330218496061).

Almost surely, 2^660436992121 is an apocalyptic number.

It is an amenable number.

660436992121 is a deficient number, since it is larger than the sum of its proper divisors (1).

660436992121 is an equidigital number, since it uses as much as digits as its factorization.

660436992121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 660436992121 in words is "six hundred sixty billion, four hundred thirty-six million, nine hundred ninety-two thousand, one hundred twenty-one".