686521465 has 16 divisors (see below), whose sum is σ = 943471872. Its totient is φ = 469779264.

The previous prime is 686521439. The next prime is 686521501. The reversal of 686521465 is 564125686.

It is a cyclic number.

It is not a de Polignac number, because 686521465 - 2⁷ = 686521337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3094 + ... + 37183.

It is an arithmetic number, because the mean of its divisors is an integer number (58966992).

Almost surely, 2^686521465 is an apocalyptic number.

It is an amenable number.

686521465 is a deficient number, since it is larger than the sum of its proper divisors (256950407).

686521465 is a wasteful number, since it uses less digits than its factorization.

686521465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40776.

The product of its digits is 345600, while the sum is 43.

The square root of 686521465 is about 26201.5546294490. The cubic root of 686521465 is about 882.1681493230.

The spelling of 686521465 in words is "six hundred eighty-six million, five hundred twenty-one thousand, four hundred sixty-five".