661846497 has 64 divisors (see below), whose sum is σ = 1040793600. Its totient is φ = 370863360.

The previous prime is 661846489. The next prime is 661846529. The reversal of 661846497 is 794648166.

It is not a de Polignac number, because 661846497 - 2³ = 661846489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661846697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1507404 + ... + 1507842.

It is an arithmetic number, because the mean of its divisors is an integer number (16262400).

Almost surely, 2^661846497 is an apocalyptic number.

It is an amenable number.

661846497 is a deficient number, since it is larger than the sum of its proper divisors (378947103).

661846497 is a wasteful number, since it uses less digits than its factorization.

661846497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558.

The product of its digits is 1741824, while the sum is 51.

The square root of 661846497 is about 25726.3774558331. The cubic root of 661846497 is about 871.4699670268.

The spelling of 661846497 in words is "six hundred sixty-one million, eight hundred forty-six thousand, four hundred ninety-seven".