661701745 has 8 divisors (see below), whose sum is σ = 794249280. Its totient is φ = 529223280.

The previous prime is 661701731. The next prime is 661701751. The reversal of 661701745 is 547107166.

661701745 is digitally balanced in base 6, 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 not a de Polignac number, because 661701745 - 2⁵ = 661701713 is a prime.

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, 6886 + ... + 37024.

It is an arithmetic number, because the mean of its divisors is an integer number (99281160).

Almost surely, 2^661701745 is an apocalyptic number.

It is an amenable number.

661701745 is a deficient number, since it is larger than the sum of its proper divisors (132547535).

661701745 is a wasteful number, since it uses less digits than its factorization.

661701745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34535.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 661701745 is about 25723.5640026805. The cubic root of 661701745 is about 871.4064295253.

The spelling of 661701745 in words is "six hundred sixty-one million, seven hundred one thousand, seven hundred forty-five".