13481400661 has 8 divisors (see below), whose sum is σ = 13510969304. Its totient is φ = 13451857920.

The previous prime is 13481400659. The next prime is 13481400677. The reversal of 13481400661 is 16600418431.

It can be written as a sum of positive squares in 4 ways, for example, as 399760036 + 13081640625 = 19994^2 + 114375^2 .

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 13481400661 - 2¹ = 13481400659 is a prime.

It is a super-2 number, since 2×13481400661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13481400631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319605 + ... + 1329781.

It is an arithmetic number, because the mean of its divisors is an integer number (1688871163).

Almost surely, 2^13481400661 is an apocalyptic number.

It is an amenable number.

13481400661 is a deficient number, since it is larger than the sum of its proper divisors (29568643).

13481400661 is a wasteful number, since it uses less digits than its factorization.

13481400661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12951.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 13481400661 in words is "thirteen billion, four hundred eighty-one million, four hundred thousand, six hundred sixty-one".