6461665 has 16 divisors (see below), whose sum is σ = 8903808. Its totient is φ = 4409856.

The previous prime is 6461657. The next prime is 6461713. The reversal of 6461665 is 5661646.

It is a 3-Lehmer number, since φ(6461665) divides (6461665-1)³.

It is a cyclic number.

It is not a de Polignac number, because 6461665 - 2³ = 6461657 is a prime.

It is a super-2 number, since 2×6461665² = 83506229144450, which contains 22 as substring.

It is a Duffinian number.

6461665 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6461665.

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, 12094 + ... + 12616.

It is an arithmetic number, because the mean of its divisors is an integer number (556488).

Almost surely, 2^6461665 is an apocalyptic number.

It is an amenable number.

6461665 is a deficient number, since it is larger than the sum of its proper divisors (2442143).

6461665 is a wasteful number, since it uses less digits than its factorization.

6461665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888.

The product of its digits is 25920, while the sum is 34.

The square root of 6461665 is about 2541.9805270694. The cubic root of 6461665 is about 186.2579475011.

The spelling of 6461665 in words is "six million, four hundred sixty-one thousand, six hundred sixty-five".