661055073 has 16 divisors (see below), whose sum is σ = 1008254976. Its totient is φ = 377395920.

The previous prime is 661055051. The next prime is 661055107. The reversal of 661055073 is 370550166.

It is not a de Polignac number, because 661055073 - 2⁵ = 661055041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661054073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9568 + ... + 37598.

It is an arithmetic number, because the mean of its divisors is an integer number (63015936).

Almost surely, 2^661055073 is an apocalyptic number.

It is an amenable number.

661055073 is a deficient number, since it is larger than the sum of its proper divisors (347199903).

661055073 is a wasteful number, since it uses less digits than its factorization.

661055073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29164.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 661055073 is about 25710.9912877742. The cubic root of 661055073 is about 871.1224658342.

The spelling of 661055073 in words is "six hundred sixty-one million, fifty-five thousand, seventy-three".