661142970 has 48 divisors (see below), whose sum is σ = 1736015112. Its totient is φ = 174556800.

The previous prime is 661142959. The next prime is 661142987. The reversal of 661142970 is 79241166.

It can be written as a sum of positive squares in 4 ways, for example, as 656845641 + 4297329 = 25629^2 + 2073^2 .

It is a super-2 number, since 2×661142970² = 874220053560841800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27277 + ... + 45456.

Almost surely, 2^661142970 is an apocalyptic number.

661142970 is an abundant number, since it is smaller than the sum of its proper divisors (1074872142).

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

661142970 is a wasteful number, since it uses less digits than its factorization.

661142970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72847 (or 72844 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 661142970 is about 25712.7005582844. The cubic root of 661142970 is about 871.1610736401.

The spelling of 661142970 in words is "six hundred sixty-one million, one hundred forty-two thousand, nine hundred seventy".