401660216929 has 2 divisors, whose sum is σ = 401660216930. Its totient is φ = 401660216928.

The previous prime is 401660216879. The next prime is 401660216941. The reversal of 401660216929 is 929612066104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389076537600 + 12583679329 = 623760^2 + 112177^2 .

It is a cyclic number.

It is not a de Polignac number, because 401660216929 - 2⁹ = 401660216417 is a prime.

It is a super-2 number, since 2×401660216929² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401660216959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200830108464 + 200830108465.

It is an arithmetic number, because the mean of its divisors is an integer number (200830108465).

Almost surely, 2^401660216929 is an apocalyptic number.

It is an amenable number.

401660216929 is a deficient number, since it is larger than the sum of its proper divisors (1).

401660216929 is an equidigital number, since it uses as much as digits as its factorization.

401660216929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 401660216929 in words is "four hundred one billion, six hundred sixty million, two hundred sixteen thousand, nine hundred twenty-nine".