661013676 has 24 divisors (see below), whose sum is σ = 1713739440. Its totient is φ = 220337856.

The previous prime is 661013671. The next prime is 661013681. The reversal of 661013676 is 676310166.

661013676 is a `hidden beast` number, since 6 + 610 + 1 + 36 + 7 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (661013671) and next prime (661013681).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 661013676.

It is not an unprimeable number, because it can be changed into a prime (661013671) 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, 3060141 + ... + 3060356.

It is an arithmetic number, because the mean of its divisors is an integer number (71405810).

Almost surely, 2^661013676 is an apocalyptic number.

It is an amenable number.

661013676 is an abundant number, since it is smaller than the sum of its proper divisors (1052725764).

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

661013676 is a wasteful number, since it uses less digits than its factorization.

661013676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6120510 (or 6120502 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 661013676 is about 25710.1862303640. The cubic root of 661013676 is about 871.1042814645.

The spelling of 661013676 in words is "six hundred sixty-one million, thirteen thousand, six hundred seventy-six".