78901021201 has 4 divisors (see below), whose sum is σ = 81621746100. Its totient is φ = 76180296304.

The previous prime is 78901021187. The next prime is 78901021217. The reversal of 78901021201 is 10212010987.

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 20904822225 + 57996198976 = 144585^2 + 240824^2 .

It is a cyclic number.

It is not a de Polignac number, because 78901021201 - 2⁹ = 78901020689 is a prime.

It is a super-2 number, since 2×78901021201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78901021271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360362406 + ... + 1360362463.

It is an arithmetic number, because the mean of its divisors is an integer number (20405436525).

Almost surely, 2^78901021201 is an apocalyptic number.

It is an amenable number.

78901021201 is a deficient number, since it is larger than the sum of its proper divisors (2720724899).

78901021201 is a wasteful number, since it uses less digits than its factorization.

78901021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720724898.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 78901021201 in words is "seventy-eight billion, nine hundred one million, twenty-one thousand, two hundred one".