661650770 has 16 divisors (see below), whose sum is σ = 1299241728. Its totient is φ = 240600240.

The previous prime is 661650751. The next prime is 661650793. The reversal of 661650770 is 77056166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3007394 + ... + 3007613.

It is an arithmetic number, because the mean of its divisors is an integer number (81202608).

Almost surely, 2^661650770 is an apocalyptic number.

661650770 is a deficient number, since it is larger than the sum of its proper divisors (637590958).

661650770 is a wasteful number, since it uses less digits than its factorization.

661650770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6015025.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 661650770 is about 25722.5731605530. The cubic root of 661650770 is about 871.3840523321.

The spelling of 661650770 in words is "six hundred sixty-one million, six hundred fifty thousand, seven hundred seventy".