6154247521861 has 2 divisors, whose sum is σ = 6154247521862. Its totient is φ = 6154247521860.

The previous prime is 6154247521843. The next prime is 6154247521897. The reversal of 6154247521861 is 1681257424516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5807950580961 + 346296940900 = 2409969^2 + 588470^2 .

It is a cyclic number.

It is not a de Polignac number, because 6154247521861 - 2¹³ = 6154247513669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6154247521799 and 6154247521808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6154247591861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077123760930 + 3077123760931.

It is an arithmetic number, because the mean of its divisors is an integer number (3077123760931).

Almost surely, 2^{6154247521861} is an apocalyptic number.

It is an amenable number.

6154247521861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6154247521861 is an equidigital number, since it uses as much as digits as its factorization.

6154247521861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 52.

The spelling of 6154247521861 in words is "six trillion, one hundred fifty-four billion, two hundred forty-seven million, five hundred twenty-one thousand, eight hundred sixty-one".