109778021641 has 16 divisors (see below), whose sum is σ = 110952866304. Its totient is φ = 108610596864.

The previous prime is 109778021597. The next prime is 109778021653. The reversal of 109778021641 is 146120877901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 109778021641 - 2¹⁷ = 109777890569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109778021591 and 109778021600.

It is not an unprimeable number, because it can be changed into a prime (109778021681) 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 15 ways as a sum of consecutive naturals, for example, 39672640 + ... + 39675406.

It is an arithmetic number, because the mean of its divisors is an integer number (6934554144).

Almost surely, 2^109778021641 is an apocalyptic number.

It is an amenable number.

109778021641 is a deficient number, since it is larger than the sum of its proper divisors (1174844663).

109778021641 is a wasteful number, since it uses less digits than its factorization.

109778021641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 109778021641 in words is "one hundred nine billion, seven hundred seventy-eight million, twenty-one thousand, six hundred forty-one".