1645662051 has 24 divisors (see below), whose sum is σ = 2597587200. Its totient is φ = 995670000.

The previous prime is 1645662041. The next prime is 1645662079. The reversal of 1645662051 is 1502665461.

1645662051 is a `hidden beast` number, since 1 + 645 + 6 + 6 + 2 + 0 + 5 + 1 = 666.

1645662051 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1645662051 - 2²¹ = 1643564899 is a prime.

It is a super-2 number, since 2×1645662051² = 5416407172203053202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1645661997 and 1645662015.

It is not an unprimeable number, because it can be changed into a prime (1645662041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45426 + ... + 73176.

It is an arithmetic number, because the mean of its divisors is an integer number (108232800).

Almost surely, 2^1645662051 is an apocalyptic number.

1645662051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1645662051 is a deficient number, since it is larger than the sum of its proper divisors (951925149).

1645662051 is a wasteful number, since it uses less digits than its factorization.

1645662051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28367 (or 28364 counting only the distinct ones).

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

The square root of 1645662051 is about 40566.7604203244. The cubic root of 1645662051 is about 1180.6292849068.

The spelling of 1645662051 in words is "one billion, six hundred forty-five million, six hundred sixty-two thousand, fifty-one".