980402791681 has 4 divisors (see below), whose sum is σ = 980422767364. Its totient is φ = 980382816000.

The previous prime is 980402791679. The next prime is 980402791703. The reversal of 980402791681 is 186197204089.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186197204089 = 13 ⋅14322861853.

It can be written as a sum of positive squares in 2 ways, for example, as 37746272656 + 942656519025 = 194284^2 + 970905^2 .

It is a cyclic number.

It is not a de Polignac number, because 980402791681 - 2¹ = 980402791679 is a prime.

It is a super-2 number, since 2×980402791681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (980402791631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9914040 + ... + 10012441.

It is an arithmetic number, because the mean of its divisors is an integer number (245105691841).

Almost surely, 2^980402791681 is an apocalyptic number.

It is an amenable number.

980402791681 is a deficient number, since it is larger than the sum of its proper divisors (19975683).

980402791681 is a wasteful number, since it uses less digits than its factorization.

980402791681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19975682.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 980402791681 in words is "nine hundred eighty billion, four hundred two million, seven hundred ninety-one thousand, six hundred eighty-one".