79154330183021 has 2 divisors, whose sum is σ = 79154330183022. Its totient is φ = 79154330183020.

The previous prime is 79154330182943. The next prime is 79154330183023. The reversal of 79154330183021 is 12038103345197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78588420030121 + 565910152900 = 8865011^2 + 752270^2 .

It is a cyclic number.

It is not a de Polignac number, because 79154330183021 - 2³⁰ = 79153256441197 is a prime.

Together with 79154330183023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79154330183023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39577165091510 + 39577165091511.

It is an arithmetic number, because the mean of its divisors is an integer number (39577165091511).

Almost surely, 2^{79154330183021} is an apocalyptic number.

It is an amenable number.

79154330183021 is a deficient number, since it is larger than the sum of its proper divisors (1).

79154330183021 is an equidigital number, since it uses as much as digits as its factorization.

79154330183021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 79154330183021 in words is "seventy-nine trillion, one hundred fifty-four billion, three hundred thirty million, one hundred eighty-three thousand, twenty-one".