851214327661 has 2 divisors, whose sum is σ = 851214327662. Its totient is φ = 851214327660.

The previous prime is 851214327641. The next prime is 851214327671. The reversal of 851214327661 is 166723412158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658751373225 + 192462954436 = 811635^2 + 438706^2 .

It is a cyclic number.

It is not a de Polignac number, because 851214327661 - 2¹⁵ = 851214294893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851214327641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425607163830 + 425607163831.

It is an arithmetic number, because the mean of its divisors is an integer number (425607163831).

Almost surely, 2^851214327661 is an apocalyptic number.

It is an amenable number.

851214327661 is a deficient number, since it is larger than the sum of its proper divisors (1).

851214327661 is an equidigital number, since it uses as much as digits as its factorization.

851214327661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The spelling of 851214327661 in words is "eight hundred fifty-one billion, two hundred fourteen million, three hundred twenty-seven thousand, six hundred sixty-one".