1620557061 has 8 divisors (see below), whose sum is σ = 2166537120. Its totient is φ = 1077474192.

The previous prime is 1620557047. The next prime is 1620557077. The reversal of 1620557061 is 1607550261.

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

It is not a de Polignac number, because 1620557061 - 2⁶ = 1620556997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620557041) 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, 722991 + ... + 725228.

It is an arithmetic number, because the mean of its divisors is an integer number (270817140).

Almost surely, 2^1620557061 is an apocalyptic number.

It is an amenable number.

1620557061 is a deficient number, since it is larger than the sum of its proper divisors (545980059).

1620557061 is a wasteful number, since it uses less digits than its factorization.

1620557061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448595.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 1620557061 is about 40256.1431461088. The cubic root of 1620557061 is about 1174.5948954471.

The spelling of 1620557061 in words is "one billion, six hundred twenty million, five hundred fifty-seven thousand, sixty-one".