401664727777 has 4 divisors (see below), whose sum is σ = 407321977536. Its totient is φ = 396007478020.

The previous prime is 401664727703. The next prime is 401664727811. The reversal of 401664727777 is 777727466104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401664727777 - 2¹⁹ = 401664203489 is a prime.

It is a super-2 number, since 2×401664727777² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401664737777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2828624773 + ... + 2828624914.

It is an arithmetic number, because the mean of its divisors is an integer number (101830494384).

Almost surely, 2^401664727777 is an apocalyptic number.

It is an amenable number.

401664727777 is a deficient number, since it is larger than the sum of its proper divisors (5657249759).

401664727777 is an equidigital number, since it uses as much as digits as its factorization.

401664727777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5657249758.

The product of its (nonzero) digits is 19361664, while the sum is 58.

The spelling of 401664727777 in words is "four hundred one billion, six hundred sixty-four million, seven hundred twenty-seven thousand, seven hundred seventy-seven".