401213511765 has 32 divisors (see below), whose sum is σ = 778111056000. Its totient is φ = 194527762560.

The previous prime is 401213511737. The next prime is 401213511847. The reversal of 401213511765 is 567115312104.

401213511765 is a `hidden beast` number, since 401 + 2 + 135 + 117 + 6 + 5 = 666.

It is not a de Polignac number, because 401213511765 - 2⁷ = 401213511637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135087240 + ... + 135090209.

It is an arithmetic number, because the mean of its divisors is an integer number (24315970500).

Almost surely, 2^401213511765 is an apocalyptic number.

401213511765 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

401213511765 is a deficient number, since it is larger than the sum of its proper divisors (376897544235).

401213511765 is a wasteful number, since it uses less digits than its factorization.

401213511765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270177474 (or 270177468 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

Adding to 401213511765 its reverse (567115312104), we get a palindrome (968328823869).

The spelling of 401213511765 in words is "four hundred one billion, two hundred thirteen million, five hundred eleven thousand, seven hundred sixty-five".