78105811020201 has 16 divisors (see below), whose sum is σ = 115881730384320. Its totient is φ = 51994302687360.

The previous prime is 78105811020199. The next prime is 78105811020253. The reversal of 78105811020201 is 10202011850187.

78105811020201 is a `hidden beast` number, since 78 + 1 + 0 + 581 + 1 + 0 + 2 + 0 + 2 + 0 + 1 = 666.

It is not a de Polignac number, because 78105811020201 - 2¹ = 78105811020199 is a prime.

It is a super-2 number, since 2×78105811020201² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78105811020401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2117703240 + ... + 2117740121.

It is an arithmetic number, because the mean of its divisors is an integer number (7242608149020).

Almost surely, 2^{78105811020201} is an apocalyptic number.

It is an amenable number.

78105811020201 is a deficient number, since it is larger than the sum of its proper divisors (37775919364119).

78105811020201 is a wasteful number, since it uses less digits than its factorization.

78105811020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235444053 (or 4235444047 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 36.

Adding to 78105811020201 its reverse (10202011850187), we get a palindrome (88307822870388).

The spelling of 78105811020201 in words is "seventy-eight trillion, one hundred five billion, eight hundred eleven million, twenty thousand, two hundred one".