7800121825156 has 6 divisors (see below), whose sum is σ = 13650213194030. Its totient is φ = 3900060912576.

The previous prime is 7800121825147. The next prime is 7800121825163. The reversal of 7800121825156 is 6515281210087.

It can be written as a sum of positive squares in only one way, i.e., 7717195104256 + 82926720900 = 2777984^2 + 287970^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975015228141 + ... + 975015228148.

Almost surely, 2^{7800121825156} is an apocalyptic number.

It is an amenable number.

7800121825156 is a deficient number, since it is larger than the sum of its proper divisors (5850091368874).

7800121825156 is a wasteful number, since it uses less digits than its factorization.

7800121825156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950030456293 (or 1950030456291 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 46.

The spelling of 7800121825156 in words is "seven trillion, eight hundred billion, one hundred twenty-one million, eight hundred twenty-five thousand, one hundred fifty-six".