7861909228161 has 32 divisors (see below), whose sum is σ = 11061389760000. Its totient is φ = 4953211855488.

The previous prime is 7861909228139. The next prime is 7861909228169. The reversal of 7861909228161 is 1618229091687.

It is not a de Polignac number, because 7861909228161 - 2⁶ = 7861909228097 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7861909228095 and 7861909228104.

It is not an unprimeable number, because it can be changed into a prime (7861909228169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137564130 + ... + 137621268.

It is an arithmetic number, because the mean of its divisors is an integer number (345668430000).

Almost surely, 2^{7861909228161} is an apocalyptic number.

It is an amenable number.

7861909228161 is a deficient number, since it is larger than the sum of its proper divisors (3199480531839).

7861909228161 is a wasteful number, since it uses less digits than its factorization.

7861909228161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63053.

The product of its (nonzero) digits is 5225472, while the sum is 60.

The spelling of 7861909228161 in words is "seven trillion, eight hundred sixty-one billion, nine hundred nine million, two hundred twenty-eight thousand, one hundred sixty-one".