20778119961 has 8 divisors (see below), whose sum is σ = 27710527200. Its totient is φ = 13848896352.

The previous prime is 20778119939. The next prime is 20778119963. The reversal of 20778119961 is 16991187702.

It is a happy number.

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

It is not a de Polignac number, because 20778119961 - 2¹⁰ = 20778118937 is a prime.

It is a super-2 number, since 2×20778119961² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20778119963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780636 + ... + 806813.

It is an arithmetic number, because the mean of its divisors is an integer number (3463815900).

Almost surely, 2^20778119961 is an apocalyptic number.

It is an amenable number.

20778119961 is a deficient number, since it is larger than the sum of its proper divisors (6932407239).

20778119961 is a wasteful number, since it uses less digits than its factorization.

20778119961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591815.

The product of its (nonzero) digits is 381024, while the sum is 51.

The spelling of 20778119961 in words is "twenty billion, seven hundred seventy-eight million, one hundred nineteen thousand, nine hundred sixty-one".