651125145221 has 2 divisors, whose sum is σ = 651125145222. Its totient is φ = 651125145220.

The previous prime is 651125145197. The next prime is 651125145241. The reversal of 651125145221 is 122541521156.

651125145221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647976700900 + 3148444321 = 804970^2 + 56111^2 .

It is a cyclic number.

It is not a de Polignac number, because 651125145221 - 2¹⁸ = 651124883077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651125145241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325562572610 + 325562572611.

It is an arithmetic number, because the mean of its divisors is an integer number (325562572611).

Almost surely, 2^651125145221 is an apocalyptic number.

It is an amenable number.

651125145221 is a deficient number, since it is larger than the sum of its proper divisors (1).

651125145221 is an equidigital number, since it uses as much as digits as its factorization.

651125145221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 35.

Adding to 651125145221 its reverse (122541521156), we get a palindrome (773666666377).

The spelling of 651125145221 in words is "six hundred fifty-one billion, one hundred twenty-five million, one hundred forty-five thousand, two hundred twenty-one".