661207011 has 16 divisors (see below), whose sum is σ = 939763200. Its totient is φ = 412315488.

The previous prime is 661207007. The next prime is 661207037. The reversal of 661207011 is 110702166.

It is not a de Polignac number, because 661207011 - 2² = 661207007 is a prime.

It is a super-2 number, since 2×661207011² = 874389422791108242, which contains 22 as substring.

661207011 is a modest number, since divided by 7011 gives 6612 as remainder.

It is not an unprimeable number, because it can be changed into a prime (661207051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68916 + ... + 77921.

It is an arithmetic number, because the mean of its divisors is an integer number (58735200).

Almost surely, 2^661207011 is an apocalyptic number.

661207011 is a deficient number, since it is larger than the sum of its proper divisors (278556189).

661207011 is a wasteful number, since it uses less digits than its factorization.

661207011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146938.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 661207011 is about 25713.9458465635. The cubic root of 661207011 is about 871.1892008015.

Adding to 661207011 its reverse (110702166), we get a palindrome (771909177).

The spelling of 661207011 in words is "six hundred sixty-one million, two hundred seven thousand, eleven".