151665623 has 4 divisors (see below), whose sum is σ = 151760808. Its totient is φ = 151570440.

The previous prime is 151665607. The next prime is 151665629. The reversal of 151665623 is 326566151.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 151665623 - 2⁴ = 151665607 is a prime.

It is a super-2 number, since 2×151665623² = 46004922399956258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151665629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45161 + ... + 48402.

It is an arithmetic number, because the mean of its divisors is an integer number (37940202).

Almost surely, 2^151665623 is an apocalyptic number.

151665623 is a deficient number, since it is larger than the sum of its proper divisors (95185).

151665623 is an equidigital number, since it uses as much as digits as its factorization.

151665623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95184.

The product of its digits is 32400, while the sum is 35.

The square root of 151665623 is about 12315.2597617752. The cubic root of 151665623 is about 533.2887037742.

The spelling of 151665623 in words is "one hundred fifty-one million, six hundred sixty-five thousand, six hundred twenty-three".