1620656541 has 48 divisors (see below), whose sum is σ = 2748620160. Its totient is φ = 900910080.

The previous prime is 1620656519. The next prime is 1620656593. The reversal of 1620656541 is 1456560261.

1620656541 is a `hidden beast` number, since 1 + 62 + 0 + 6 + 56 + 541 = 666.

It is not a de Polignac number, because 1620656541 - 2¹⁷ = 1620525469 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1620656496 and 1620656505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620656041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 760165 + ... + 762293.

It is an arithmetic number, because the mean of its divisors is an integer number (57262920).

Almost surely, 2^1620656541 is an apocalyptic number.

It is an amenable number.

1620656541 is a deficient number, since it is larger than the sum of its proper divisors (1127963619).

1620656541 is a wasteful number, since it uses less digits than its factorization.

1620656541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466 (or 2463 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1620656541 is about 40257.3787149635. The cubic root of 1620656541 is about 1174.6189296330.

The spelling of 1620656541 in words is "one billion, six hundred twenty million, six hundred fifty-six thousand, five hundred forty-one".