661061506 has 8 divisors (see below), whose sum is σ = 1133248320. Its totient is φ = 283312068.

The previous prime is 661061503. The next prime is 661061521. The reversal of 661061506 is 605160166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661061503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23609326 + ... + 23609353.

It is an arithmetic number, because the mean of its divisors is an integer number (141656040).

Almost surely, 2^661061506 is an apocalyptic number.

661061506 is a deficient number, since it is larger than the sum of its proper divisors (472186814).

661061506 is a wasteful number, since it uses less digits than its factorization.

661061506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47218688.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 661061506 is about 25711.1163896086. The cubic root of 661061506 is about 871.1252915759.

The spelling of 661061506 in words is "six hundred sixty-one million, sixty-one thousand, five hundred six".