65072519 has 4 divisors (see below), whose sum is σ = 65648496. Its totient is φ = 64496544.

The previous prime is 65072509. The next prime is 65072521. The reversal of 65072519 is 91527056.

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 65072519 - 2¹⁶ = 65006983 is a prime.

It is a super-2 number, since 2×65072519² = 8468865458010722, 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 (65072509) 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, 287819 + ... + 288044.

It is an arithmetic number, because the mean of its divisors is an integer number (16412124).

Almost surely, 2^65072519 is an apocalyptic number.

65072519 is a deficient number, since it is larger than the sum of its proper divisors (575977).

65072519 is a wasteful number, since it uses less digits than its factorization.

65072519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575976.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 65072519 is about 8066.7539320349. The cubic root of 65072519 is about 402.2220479832. Note that the first 3 decimals are identical.

The spelling of 65072519 in words is "sixty-five million, seventy-two thousand, five hundred nineteen".