661770406 has 8 divisors (see below), whose sum is σ = 1082897064. Its totient is φ = 300804720.

The previous prime is 661770391. The next prime is 661770433. The reversal of 661770406 is 604077166.

661770406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 15040215 + ... + 15040258.

It is an arithmetic number, because the mean of its divisors is an integer number (135362133).

Almost surely, 2^661770406 is an apocalyptic number.

661770406 is a deficient number, since it is larger than the sum of its proper divisors (421126658).

661770406 is a wasteful number, since it uses less digits than its factorization.

661770406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30080486.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 661770406 is about 25724.8985615104. The cubic root of 661770406 is about 871.4365687675.

The spelling of 661770406 in words is "six hundred sixty-one million, seven hundred seventy thousand, four hundred six".