661220546 has 16 divisors (see below), whose sum is σ = 1159882944. Its totient is φ = 276789744.

The previous prime is 661220543. The next prime is 661220563. The reversal of 661220546 is 645022166.

661220546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×661220546² = 874425220905076232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661220543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548585 + ... + 549788.

It is an arithmetic number, because the mean of its divisors is an integer number (72492684).

Almost surely, 2^661220546 is an apocalyptic number.

661220546 is a deficient number, since it is larger than the sum of its proper divisors (498662398).

661220546 is a wasteful number, since it uses less digits than its factorization.

661220546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098425.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 661220546 is about 25714.2090292507. The cubic root of 661220546 is about 871.1951452159.

The spelling of 661220546 in words is "six hundred sixty-one million, two hundred twenty thousand, five hundred forty-six".