661382616 has 32 divisors (see below), whose sum is σ = 1660566960. Its totient is φ = 219512832.

The previous prime is 661382611. The next prime is 661382621. The reversal of 661382616 is 616283166.

It is an interprime number because it is at equal distance from previous prime (661382611) and next prime (661382621).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661382611) 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, 53545 + ... + 64728.

Almost surely, 2^661382616 is an apocalyptic number.

It is an amenable number.

661382616 is an abundant number, since it is smaller than the sum of its proper divisors (999184344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661382616 is a wasteful number, since it uses less digits than its factorization.

661382616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118515 (or 118511 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 661382616 is about 25717.3602066775. The cubic root of 661382616 is about 871.2663181721.

The spelling of 661382616 in words is "six hundred sixty-one million, three hundred eighty-two thousand, six hundred sixteen".