667670801761 has 2 divisors, whose sum is σ = 667670801762. Its totient is φ = 667670801760.

The previous prime is 667670801737. The next prime is 667670801767. The reversal of 667670801761 is 167108076766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 545908188736 + 121762613025 = 738856^2 + 348945^2 .

It is a cyclic number.

It is not a de Polignac number, because 667670801761 - 2¹⁵ = 667670768993 is a prime.

It is a super-2 number, since 2×667670801761² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667670801767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333835400880 + 333835400881.

It is an arithmetic number, because the mean of its divisors is an integer number (333835400881).

Almost surely, 2^667670801761 is an apocalyptic number.

It is an amenable number.

667670801761 is a deficient number, since it is larger than the sum of its proper divisors (1).

667670801761 is an equidigital number, since it uses as much as digits as its factorization.

667670801761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 667670801761 in words is "six hundred sixty-seven billion, six hundred seventy million, eight hundred one thousand, seven hundred sixty-one".