661875070 has 16 divisors (see below), whose sum is σ = 1254079440. Its totient is φ = 250815744.

The previous prime is 661875061. The next prime is 661875083. The reversal of 661875070 is 70578166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1741587 + ... + 1741966.

It is an arithmetic number, because the mean of its divisors is an integer number (78379965).

Almost surely, 2^661875070 is an apocalyptic number.

661875070 is a deficient number, since it is larger than the sum of its proper divisors (592204370).

661875070 is a wasteful number, since it uses less digits than its factorization.

661875070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483579.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 661875070 is about 25726.9327748179. The cubic root of 661875070 is about 871.4825077761.

The spelling of 661875070 in words is "six hundred sixty-one million, eight hundred seventy-five thousand, seventy".