661226601 has 8 divisors (see below), whose sum is σ = 1007583424. Its totient is φ = 377843760.

The previous prime is 661226567. The next prime is 661226617. The reversal of 661226601 is 106622166.

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

It is not a de Polignac number, because 661226601 - 2⁷ = 661226473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661226681) 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, 15743470 + ... + 15743511.

It is an arithmetic number, because the mean of its divisors is an integer number (125947928).

Almost surely, 2^661226601 is an apocalyptic number.

It is an amenable number.

661226601 is a deficient number, since it is larger than the sum of its proper divisors (346356823).

661226601 is a wasteful number, since it uses less digits than its factorization.

661226601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31486991.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 661226601 is about 25714.3267654434. The cubic root of 661226601 is about 871.1978044751.

Adding to 661226601 its reverse (106622166), we get a palindrome (767848767).

The spelling of 661226601 in words is "six hundred sixty-one million, two hundred twenty-six thousand, six hundred one".