1620656051 has 8 divisors (see below), whose sum is σ = 1853485920. Its totient is φ = 1388153088.

The previous prime is 1620656041. The next prime is 1620656117. The reversal of 1620656051 is 1506560261.

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

It is not a de Polignac number, because 1620656051 - 2⁶ = 1620655987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1620655999 and 1620656017.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71006 + ... + 91011.

It is an arithmetic number, because the mean of its divisors is an integer number (231685740).

Almost surely, 2^1620656051 is an apocalyptic number.

1620656051 is a deficient number, since it is larger than the sum of its proper divisors (232829869).

1620656051 is a wasteful number, since it uses less digits than its factorization.

1620656051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163453.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1620656051 is about 40257.3726291222. The cubic root of 1620656051 is about 1174.6188112523.

The spelling of 1620656051 in words is "one billion, six hundred twenty million, six hundred fifty-six thousand, fifty-one".