150601666 has 4 divisors (see below), whose sum is σ = 225902502. Its totient is φ = 75300832.

The previous prime is 150601663. The next prime is 150601667. The reversal of 150601666 is 666106051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666106051 = 13 ⋅51238927.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 45846441 = 10235^2 + 6771^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (150601663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37650415 + ... + 37650418.

Almost surely, 2^150601666 is an apocalyptic number.

150601666 is a deficient number, since it is larger than the sum of its proper divisors (75300836).

150601666 is an equidigital number, since it uses as much as digits as its factorization.

150601666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75300835.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 150601666 is about 12271.9870436698. The cubic root of 150601666 is about 532.0387430092.

The spelling of 150601666 in words is "one hundred fifty million, six hundred one thousand, six hundred sixty-six".