151666819 has 2 divisors, whose sum is σ = 151666820. Its totient is φ = 151666818.

The previous prime is 151666817. The next prime is 151666861. The reversal of 151666819 is 918666151.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 151666819 - 2¹ = 151666817 is a prime.

It is a super-2 number, since 2×151666819² = 46005647971157522, which contains 22 as substring.

Together with 151666817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (151666817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75833409 + 75833410.

It is an arithmetic number, because the mean of its divisors is an integer number (75833410).

Almost surely, 2^151666819 is an apocalyptic number.

151666819 is a deficient number, since it is larger than the sum of its proper divisors (1).

151666819 is an equidigital number, since it uses as much as digits as its factorization.

151666819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 151666819 is about 12315.3083193236. The cubic root of 151666819 is about 533.2901055676.

The spelling of 151666819 in words is "one hundred fifty-one million, six hundred sixty-six thousand, eight hundred nineteen".