661227251 has 8 divisors (see below), whose sum is σ = 672948000. Its totient is φ = 649535040.

The previous prime is 661227233. The next prime is 661227313. The reversal of 661227251 is 152722166.

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 661227251 - 2⁶ = 661227187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661227451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42650 + ... + 56048.

It is an arithmetic number, because the mean of its divisors is an integer number (84118500).

Almost surely, 2^661227251 is an apocalyptic number.

661227251 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

661227251 is a deficient number, since it is larger than the sum of its proper divisors (11720749).

661227251 is a wasteful number, since it uses less digits than its factorization.

661227251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14269.

The product of its digits is 10080, while the sum is 32.

The square root of 661227251 is about 25714.3394043090. The cubic root of 661227251 is about 871.1980899438.

The spelling of 661227251 in words is "six hundred sixty-one million, two hundred twenty-seven thousand, two hundred fifty-one".