661674761 has 8 divisors (see below), whose sum is σ = 722170848. Its totient is φ = 601236000.

The previous prime is 661674749. The next prime is 661674763. The reversal of 661674761 is 167476166.

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 661674761 - 2¹⁰ = 661673737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661674763) 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, 11906 + ... + 38276.

It is an arithmetic number, because the mean of its divisors is an integer number (90271356).

Almost surely, 2^661674761 is an apocalyptic number.

It is an amenable number.

661674761 is a deficient number, since it is larger than the sum of its proper divisors (60496087).

661674761 is a wasteful number, since it uses less digits than its factorization.

661674761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28663.

The product of its digits is 254016, while the sum is 44.

The square root of 661674761 is about 25723.0394976954. The cubic root of 661674761 is about 871.3945841328.

The spelling of 661674761 in words is "six hundred sixty-one million, six hundred seventy-four thousand, seven hundred sixty-one".