661364253 has 24 divisors (see below), whose sum is σ = 1051390080. Its totient is φ = 397272960.

The previous prime is 661364239. The next prime is 661364269. The reversal of 661364253 is 352463166.

661364253 is a `hidden beast` number, since 6 + 6 + 1 + 3 + 642 + 5 + 3 = 666.

It is not a de Polignac number, because 661364253 - 2⁴ = 661364237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661364653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18373 + ... + 40746.

It is an arithmetic number, because the mean of its divisors is an integer number (43807920).

Almost surely, 2^661364253 is an apocalyptic number.

It is an amenable number.

661364253 is a deficient number, since it is larger than the sum of its proper divisors (390025827).

661364253 is a wasteful number, since it uses less digits than its factorization.

661364253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59249 (or 59246 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 661364253 is about 25717.0031885521. The cubic root of 661364253 is about 871.2582546543.

The spelling of 661364253 in words is "six hundred sixty-one million, three hundred sixty-four thousand, two hundred fifty-three".