405691472665 has 16 divisors (see below), whose sum is σ = 488841268608. Its totient is φ = 323214022656.

The previous prime is 405691472657. The next prime is 405691472677. The reversal of 405691472665 is 566274196504.

It is a cyclic number.

It is not a de Polignac number, because 405691472665 - 2³ = 405691472657 is a prime.

It is a Duffinian number.

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, 1655244 + ... + 1884466.

It is an arithmetic number, because the mean of its divisors is an integer number (30552579288).

Almost surely, 2^405691472665 is an apocalyptic number.

It is an amenable number.

405691472665 is a deficient number, since it is larger than the sum of its proper divisors (83149795943).

405691472665 is a wasteful number, since it uses less digits than its factorization.

405691472665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230688.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 405691472665 in words is "four hundred five billion, six hundred ninety-one million, four hundred seventy-two thousand, six hundred sixty-five".