661813070 has 8 divisors (see below), whose sum is σ = 1191263544. Its totient is φ = 264725224.

The previous prime is 661813027. The next prime is 661813093. The reversal of 661813070 is 70318166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33090644 + ... + 33090663.

It is an arithmetic number, because the mean of its divisors is an integer number (148907943).

Almost surely, 2^661813070 is an apocalyptic number.

661813070 is a deficient number, since it is larger than the sum of its proper divisors (529450474).

661813070 is a wasteful number, since it uses less digits than its factorization.

661813070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66181314.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 661813070 is about 25725.7277836799. The cubic root of 661813070 is about 871.4552953886.

The spelling of 661813070 in words is "six hundred sixty-one million, eight hundred thirteen thousand, seventy".