481640661 has 10 divisors (see below), whose sum is σ = 719488022. Its totient is φ = 321093720.

The previous prime is 481640657. The next prime is 481640693. The reversal of 481640661 is 166046184.

481640661 is a `hidden beast` number, since 4 + 8 + 1 + 640 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 335109636 + 146531025 = 18306^2 + 12105^2 .

It is not a de Polignac number, because 481640661 - 2² = 481640657 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 (481640461) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2973010 + ... + 2973171.

Almost surely, 2^481640661 is an apocalyptic number.

It is an amenable number.

481640661 is a deficient number, since it is larger than the sum of its proper divisors (237847361).

481640661 is an equidigital number, since it uses as much as digits as its factorization.

481640661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946193 (or 5946184 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 481640661 is about 21946.3131527826. The cubic root of 481640661 is about 783.8645930290.

The spelling of 481640661 in words is "four hundred eighty-one million, six hundred forty thousand, six hundred sixty-one".