1851872224261 has 2 divisors, whose sum is σ = 1851872224262. Its totient is φ = 1851872224260.

The previous prime is 1851872224247. The next prime is 1851872224273. The reversal of 1851872224261 is 1624222781581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1585622416225 + 266249808036 = 1259215^2 + 515994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851872224261 - 2⁹ = 1851872223749 is a prime.

It is a super-2 number, since 2×1851872224261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1851872224231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925936112130 + 925936112131.

It is an arithmetic number, because the mean of its divisors is an integer number (925936112131).

Almost surely, 2^{1851872224261} is an apocalyptic number.

It is an amenable number.

1851872224261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851872224261 is an equidigital number, since it uses as much as digits as its factorization.

1851872224261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 860160, while the sum is 49.

The spelling of 1851872224261 in words is "one trillion, eight hundred fifty-one billion, eight hundred seventy-two million, two hundred twenty-four thousand, two hundred sixty-one".