78196805001861 has 64 divisors (see below), whose sum is σ = 135896115350016. Its totient is φ = 38813322240000.

The previous prime is 78196805001857. The next prime is 78196805001869. The reversal of 78196805001861 is 16810050869187.

It is not a de Polignac number, because 78196805001861 - 2² = 78196805001857 is a prime.

It is a super-2 number, since 2×78196805001861² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78196805001795 and 78196805001804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78196805001869) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23998681 + ... + 27061601.

It is an arithmetic number, because the mean of its divisors is an integer number (2123376802344).

Almost surely, 2^{78196805001861} is an apocalyptic number.

It is an amenable number.

78196805001861 is a deficient number, since it is larger than the sum of its proper divisors (57699310348155).

78196805001861 is a wasteful number, since it uses less digits than its factorization.

78196805001861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068462.

The product of its (nonzero) digits is 5806080, while the sum is 60.

The spelling of 78196805001861 in words is "seventy-eight trillion, one hundred ninety-six billion, eight hundred five million, one thousand, eight hundred sixty-one".