661260253 has 8 divisors (see below), whose sum is σ = 671914656. Its totient is φ = 650670000.

The previous prime is 661260251. The next prime is 661260283. The reversal of 661260253 is 352062166.

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 661260253 - 2¹ = 661260251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661260251) 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, 4963 + ... + 36703.

It is an arithmetic number, because the mean of its divisors is an integer number (83989332).

Almost surely, 2^661260253 is an apocalyptic number.

It is an amenable number.

661260253 is a deficient number, since it is larger than the sum of its proper divisors (10654403).

661260253 is a wasteful number, since it uses less digits than its factorization.

661260253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32075.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 661260253 is about 25714.9811005180. The cubic root of 661260253 is about 871.2125835998.

The spelling of 661260253 in words is "six hundred sixty-one million, two hundred sixty thousand, two hundred fifty-three".