19611960549961 has 8 divisors (see below), whose sum is σ = 22362959541384. Its totient is φ = 17038445364480.

The previous prime is 19611960549911. The next prime is 19611960549997. The reversal of 19611960549961 is 16994506911691.

It can be written as a sum of positive squares in 4 ways, for example, as 288858951936 + 19323101598025 = 537456^2 + 4395805^2 .

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 19611960549961 - 2⁷ = 19611960549833 is a prime.

It is a super-2 number, since 2×19611960549961² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19611960549911) 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, 44370951250 + ... + 44370951691.

It is an arithmetic number, because the mean of its divisors is an integer number (2795369942673).

Almost surely, 2^{19611960549961} is an apocalyptic number.

It is an amenable number.

19611960549961 is a deficient number, since it is larger than the sum of its proper divisors (2750998991423).

19611960549961 is a wasteful number, since it uses less digits than its factorization.

19611960549961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88741902971.

The product of its (nonzero) digits is 28343520, while the sum is 67.

The spelling of 19611960549961 in words is "nineteen trillion, six hundred eleven billion, nine hundred sixty million, five hundred forty-nine thousand, nine hundred sixty-one".