44778353981 has 2 divisors, whose sum is σ = 44778353982. Its totient is φ = 44778353980.

The previous prime is 44778353951. The next prime is 44778353993. The reversal of 44778353981 is 18935387744.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44266056025 + 512297956 = 210395^2 + 22634^2 .

It is a cyclic number.

It is not a de Polignac number, because 44778353981 - 2³⁰ = 43704612157 is a prime.

It is a super-2 number, since 2×44778353981² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 44778353981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44778353941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22389176990 + 22389176991.

It is an arithmetic number, because the mean of its divisors is an integer number (22389176991).

Almost surely, 2^44778353981 is an apocalyptic number.

It is an amenable number.

44778353981 is a deficient number, since it is larger than the sum of its proper divisors (1).

44778353981 is an equidigital number, since it uses as much as digits as its factorization.

44778353981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The spelling of 44778353981 in words is "forty-four billion, seven hundred seventy-eight million, three hundred fifty-three thousand, nine hundred eighty-one".