661131335 has 4 divisors (see below), whose sum is σ = 793357608. Its totient is φ = 528905064.

The previous prime is 661131323. The next prime is 661131337. The reversal of 661131335 is 533131166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 533131166 = 2 ⋅266565583.

It is a cyclic number.

It is not a de Polignac number, because 661131335 - 2⁴ = 661131319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661131298 and 661131307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661131337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66113129 + ... + 66113138.

It is an arithmetic number, because the mean of its divisors is an integer number (198339402).

Almost surely, 2^661131335 is an apocalyptic number.

661131335 is a deficient number, since it is larger than the sum of its proper divisors (132226273).

661131335 is a wasteful number, since it uses less digits than its factorization.

661131335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132226272.

The product of its digits is 4860, while the sum is 29.

The square root of 661131335 is about 25712.4743072307. The cubic root of 661131335 is about 871.1559632888.

The spelling of 661131335 in words is "six hundred sixty-one million, one hundred thirty-one thousand, three hundred thirty-five".