1621006065 has 48 divisors (see below), whose sum is σ = 3242992896. Its totient is φ = 733680000.

The previous prime is 1621006043. The next prime is 1621006087. The reversal of 1621006065 is 5606001261.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1621006043) and next prime (1621006087).

It is not a de Polignac number, because 1621006065 - 2¹⁰ = 1621005041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6340 + ... + 57290.

It is an arithmetic number, because the mean of its divisors is an integer number (67562352).

Almost surely, 2^1621006065 is an apocalyptic number.

1621006065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1621006065 is an abundant number, since it is smaller than the sum of its proper divisors (1621986831).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621006065 is a wasteful number, since it uses less digits than its factorization.

1621006065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51070 (or 51067 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1621006065 is about 40261.7195981493. The cubic root of 1621006065 is about 1174.7033661942.

The spelling of 1621006065 in words is "one billion, six hundred twenty-one million, six thousand, sixty-five".