620166561 has 8 divisors (see below), whose sum is σ = 945015744. Its totient is φ = 354380880.

The previous prime is 620166541. The next prime is 620166571. The reversal of 620166561 is 165661026.

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

It is not a de Polignac number, because 620166561 - 2⁵ = 620166529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620166541) 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, 14765850 + ... + 14765891.

It is an arithmetic number, because the mean of its divisors is an integer number (118126968).

Almost surely, 2^620166561 is an apocalyptic number.

It is an amenable number.

620166561 is a deficient number, since it is larger than the sum of its proper divisors (324849183).

620166561 is a wasteful number, since it uses less digits than its factorization.

620166561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29531751.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 620166561 is about 24903.1435967430. The cubic root of 620166561 is about 852.7782500295.

The spelling of 620166561 in words is "six hundred twenty million, one hundred sixty-six thousand, five hundred sixty-one".