55196963981 has 4 divisors (see below), whose sum is σ = 55197736572. Its totient is φ = 55196191392.

The previous prime is 55196963971. The next prime is 55196964019. The reversal of 55196963981 is 18936969155.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43345158025 + 11851805956 = 208195^2 + 108866^2 .

It is a cyclic number.

It is not a de Polignac number, because 55196963981 - 2¹⁰ = 55196962957 is a prime.

It is a super-2 number, since 2×55196963981² (a number of 22 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 (55196963971) 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, 266810 + ... + 426123.

It is an arithmetic number, because the mean of its divisors is an integer number (13799434143).

Almost surely, 2^55196963981 is an apocalyptic number.

It is an amenable number.

55196963981 is a deficient number, since it is larger than the sum of its proper divisors (772591).

55196963981 is an equidigital number, since it uses as much as digits as its factorization.

55196963981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772590.

The product of its digits is 15746400, while the sum is 62.

The spelling of 55196963981 in words is "fifty-five billion, one hundred ninety-six million, nine hundred sixty-three thousand, nine hundred eighty-one".