661048685 has 16 divisors (see below), whose sum is σ = 880044480. Its totient is φ = 472611840.

The previous prime is 661048673. The next prime is 661048691. The reversal of 661048685 is 586840166.

It is not a de Polignac number, because 661048685 - 2²⁶ = 593939821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98612 + ... + 105101.

It is an arithmetic number, because the mean of its divisors is an integer number (55002780).

Almost surely, 2^661048685 is an apocalyptic number.

It is an amenable number.

661048685 is a deficient number, since it is larger than the sum of its proper divisors (218995795).

661048685 is a wasteful number, since it uses less digits than its factorization.

661048685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203788.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 661048685 is about 25710.8670604474. The cubic root of 661048685 is about 871.1196598409.

The spelling of 661048685 in words is "six hundred sixty-one million, forty-eight thousand, six hundred eighty-five".