73151665 has 4 divisors (see below), whose sum is σ = 87782004. Its totient is φ = 58521328.

The previous prime is 73151657. The next prime is 73151671. The reversal of 73151665 is 56615137.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22014864 + 51136801 = 4692^2 + 7151^2 .

It is a cyclic number.

It is not a de Polignac number, because 73151665 - 2³ = 73151657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73151665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7315162 + ... + 7315171.

It is an arithmetic number, because the mean of its divisors is an integer number (21945501).

Almost surely, 2^73151665 is an apocalyptic number.

It is an amenable number.

73151665 is a deficient number, since it is larger than the sum of its proper divisors (14630339).

73151665 is a wasteful number, since it uses less digits than its factorization.

73151665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14630338.

The product of its digits is 18900, while the sum is 34.

The square root of 73151665 is about 8552.8746629423. The cubic root of 73151665 is about 418.2231529787.

The spelling of 73151665 in words is "seventy-three million, one hundred fifty-one thousand, six hundred sixty-five".