1620166051 has 16 divisors (see below), whose sum is σ = 1926430720. Its totient is φ = 1333311840.

The previous prime is 1620166033. The next prime is 1620166091. The reversal of 1620166051 is 1506610261.

It is not a de Polignac number, because 1620166051 - 2¹³ = 1620157859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620166091) 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 15 ways as a sum of consecutive naturals, for example, 1836 + ... + 56953.

It is an arithmetic number, because the mean of its divisors is an integer number (120401920).

Almost surely, 2^1620166051 is an apocalyptic number.

1620166051 is a deficient number, since it is larger than the sum of its proper divisors (306264669).

1620166051 is a wasteful number, since it uses less digits than its factorization.

1620166051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58954.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1620166051 is about 40251.2863272716. The cubic root of 1620166051 is about 1174.5004186147.

The spelling of 1620166051 in words is "one billion, six hundred twenty million, one hundred sixty-six thousand, fifty-one".