661563479354 has 8 divisors (see below), whose sum is σ = 992365750560. Its totient is φ = 330774895836.

The previous prime is 661563479341. The next prime is 661563479377. The reversal of 661563479354 is 453974365166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 661563479293 and 661563479302.

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, 3300224 + ... + 3494939.

It is an arithmetic number, because the mean of its divisors is an integer number (124045718820).

Almost surely, 2^661563479354 is an apocalyptic number.

661563479354 is a deficient number, since it is larger than the sum of its proper divisors (330802271206).

661563479354 is a wasteful number, since it uses less digits than its factorization.

661563479354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843844.

The product of its digits is 48988800, while the sum is 59.

The spelling of 661563479354 in words is "six hundred sixty-one billion, five hundred sixty-three million, four hundred seventy-nine thousand, three hundred fifty-four".