151662378221 has 2 divisors, whose sum is σ = 151662378222. Its totient is φ = 151662378220.

The previous prime is 151662378157. The next prime is 151662378251. The reversal of 151662378221 is 122873266151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147909468100 + 3752910121 = 384590^2 + 61261^2 .

It is a cyclic number.

It is not a de Polignac number, because 151662378221 - 2⁶ = 151662378157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151662378251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75831189110 + 75831189111.

It is an arithmetic number, because the mean of its divisors is an integer number (75831189111).

Almost surely, 2^151662378221 is an apocalyptic number.

It is an amenable number.

151662378221 is a deficient number, since it is larger than the sum of its proper divisors (1).

151662378221 is an equidigital number, since it uses as much as digits as its factorization.

151662378221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The spelling of 151662378221 in words is "one hundred fifty-one billion, six hundred sixty-two million, three hundred seventy-eight thousand, two hundred twenty-one".