661652619 has 8 divisors (see below), whose sum is σ = 885895680. Its totient is φ = 439255656.

The previous prime is 661652591. The next prime is 661652627. The reversal of 661652619 is 916256166.

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

It is not a de Polignac number, because 661652619 - 2⁵ = 661652587 is a prime.

It is a super-2 number, since 2×661652619² = 875568376459118322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661652639) 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, 460687 + ... + 462120.

It is an arithmetic number, because the mean of its divisors is an integer number (110736960).

Almost surely, 2^661652619 is an apocalyptic number.

661652619 is a deficient number, since it is larger than the sum of its proper divisors (224243061).

661652619 is a wasteful number, since it uses less digits than its factorization.

661652619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923049.

The product of its digits is 116640, while the sum is 42.

The square root of 661652619 is about 25722.6091017222. The cubic root of 661652619 is about 871.3848640330.

The spelling of 661652619 in words is "six hundred sixty-one million, six hundred fifty-two thousand, six hundred nineteen".