401169777381 has 20 divisors (see below), whose sum is σ = 601895273100. Its totient is φ = 266278617216.

The previous prime is 401169777377. The next prime is 401169777389. The reversal of 401169777381 is 183777961104.

It is a happy number.

401169777381 is a `hidden beast` number, since 401 + 1 + 6 + 97 + 7 + 73 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 385350426756 + 15819350625 = 620766^2 + 125775^2 .

It is not a de Polignac number, because 401169777381 - 2² = 401169777377 is a prime.

It is a super-2 number, since 2×401169777381² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401169777389) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10795236 + ... + 10832333.

It is an arithmetic number, because the mean of its divisors is an integer number (30094763655).

Almost surely, 2^401169777381 is an apocalyptic number.

It is an amenable number.

401169777381 is a deficient number, since it is larger than the sum of its proper divisors (200725495719).

401169777381 is a wasteful number, since it uses less digits than its factorization.

401169777381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21627810 (or 21627801 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 401169777381 in words is "four hundred one billion, one hundred sixty-nine million, seven hundred seventy-seven thousand, three hundred eighty-one".