661135267 has 24 divisors (see below), whose sum is σ = 761280000. Its totient is φ = 572259168.

The previous prime is 661135259. The next prime is 661135271. The reversal of 661135267 is 762531166.

It is not a de Polignac number, because 661135267 - 2³ = 661135259 is a prime.

It is a super-2 number, since 2×661135267² = 874199682542322578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661135217) 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, 329734 + ... + 331732.

It is an arithmetic number, because the mean of its divisors is an integer number (31720000).

Almost surely, 2^661135267 is an apocalyptic number.

661135267 is a deficient number, since it is larger than the sum of its proper divisors (100144733).

661135267 is a wasteful number, since it uses less digits than its factorization.

661135267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147 (or 2134 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 661135267 is about 25712.5507680588. The cubic root of 661135267 is about 871.1576903176.

The spelling of 661135267 in words is "six hundred sixty-one million, one hundred thirty-five thousand, two hundred sixty-seven".