405652661 has 8 divisors (see below), whose sum is σ = 408038400. Its totient is φ = 403272720.

The previous prime is 405652651. The next prime is 405652697. The reversal of 405652661 is 166256504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405652661 - 2²² = 401458357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405652601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281180 + ... + 282618.

It is an arithmetic number, because the mean of its divisors is an integer number (51004800).

Almost surely, 2^405652661 is an apocalyptic number.

It is an amenable number.

405652661 is a deficient number, since it is larger than the sum of its proper divisors (2385739).

405652661 is a wasteful number, since it uses less digits than its factorization.

405652661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 405652661 is about 20140.8207628190. The cubic root of 405652661 is about 740.2608412087.

The spelling of 405652661 in words is "four hundred five million, six hundred fifty-two thousand, six hundred sixty-one".