401261327765 has 8 divisors (see below), whose sum is σ = 485931149880. Its totient is φ = 318064024512.

The previous prime is 401261327749. The next prime is 401261327771. The reversal of 401261327765 is 567723162104.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 205007011729 + 196254316036 = 452777^2 + 443006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401261327765 - 2⁴ = 401261327749 is a prime.

It is a super-2 number, since 2×401261327765² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368129114 + ... + 368130203.

It is an arithmetic number, because the mean of its divisors is an integer number (60741393735).

Almost surely, 2^401261327765 is an apocalyptic number.

It is an amenable number.

401261327765 is a deficient number, since it is larger than the sum of its proper divisors (84669822115).

401261327765 is a wasteful number, since it uses less digits than its factorization.

401261327765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736259431.

The product of its (nonzero) digits is 423360, while the sum is 44.

Adding to 401261327765 its reverse (567723162104), we get a palindrome (968984489869).

The spelling of 401261327765 in words is "four hundred one billion, two hundred sixty-one million, three hundred twenty-seven thousand, seven hundred sixty-five".