401537609361 has 18 divisors (see below), whose sum is σ = 674692446402. Its totient is φ = 229450062240.

The previous prime is 401537609359. The next prime is 401537609383. The reversal of 401537609361 is 163906735104.

It is a happy number.

401537609361 is a `hidden beast` number, since 4 + 0 + 1 + 5 + 3 + 7 + 609 + 36 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 265553671761 + 135983937600 = 515319^2 + 368760^2 .

It is not a de Polignac number, because 401537609361 - 2¹ = 401537609359 is a prime.

It is a super-2 number, since 2×401537609361² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401537609861) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 455257620 + ... + 455258501.

It is an arithmetic number, because the mean of its divisors is an integer number (37482913689).

Almost surely, 2^401537609361 is an apocalyptic number.

It is an amenable number.

401537609361 is a deficient number, since it is larger than the sum of its proper divisors (273154837041).

401537609361 is a wasteful number, since it uses less digits than its factorization.

401537609361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910516141 (or 910516131 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 401537609361 in words is "four hundred one billion, five hundred thirty-seven million, six hundred nine thousand, three hundred sixty-one".