661067026 has 16 divisors (see below), whose sum is σ = 1022275800. Its totient is φ = 320411520.

The previous prime is 661067021. The next prime is 661067041. The reversal of 661067026 is 620760166.

It can be written as a sum of positive squares in 4 ways, for example, as 177023025 + 484044001 = 13305^2 + 22001^2 .

It is a super-2 number, since 2×661067026² = 874019225728969352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661066982 and 661067000.

It is not an unprimeable number, because it can be changed into a prime (661067021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12801 + ... + 38548.

Almost surely, 2^661067026 is an apocalyptic number.

661067026 is a deficient number, since it is larger than the sum of its proper divisors (361208774).

661067026 is a wasteful number, since it uses less digits than its factorization.

661067026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51549.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 661067026 is about 25711.2237359485. The cubic root of 661067026 is about 871.1277162611.

The spelling of 661067026 in words is "six hundred sixty-one million, sixty-seven thousand, twenty-six".