505670661 has 32 divisors (see below), whose sum is σ = 794862720. Its totient is φ = 316622592.

The previous prime is 505670657. The next prime is 505670689. The reversal of 505670661 is 166076505.

It is a happy number.

It is not a de Polignac number, because 505670661 - 2² = 505670657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505670621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312691 + ... + 314303.

It is an arithmetic number, because the mean of its divisors is an integer number (24839460).

Almost surely, 2^505670661 is an apocalyptic number.

505670661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

505670661 is a deficient number, since it is larger than the sum of its proper divisors (289192059).

505670661 is a wasteful number, since it uses less digits than its factorization.

505670661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322 (or 2316 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 505670661 is about 22487.1221146682. The cubic root of 505670661 is about 796.6897913103.

The spelling of 505670661 in words is "five hundred five million, six hundred seventy thousand, six hundred sixty-one".