661067000 has 128 divisors (see below), whose sum is σ = 1776902400. Its totient is φ = 227664000.

The previous prime is 661066979. The next prime is 661067021. The reversal of 661067000 is 760166.

It is an interprime number because it is at equal distance from previous prime (661066979) and next prime (661067021).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207419 + ... + 210581.

It is an arithmetic number, because the mean of its divisors is an integer number (13882050).

Almost surely, 2^661067000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661067000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888451200).

661067000 is an abundant number, since it is smaller than the sum of its proper divisors (1115835400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661067000 is a wasteful number, since it uses less digits than its factorization.

661067000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214 (or 3200 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 661067000 is about 25711.2232303327. The cubic root of 661067000 is about 871.1277048405.

The spelling of 661067000 in words is "six hundred sixty-one million, sixty-seven thousand".