8051605621 has 2 divisors, whose sum is σ = 8051605622. Its totient is φ = 8051605620.

The previous prime is 8051605613. The next prime is 8051605633. The reversal of 8051605621 is 1265061508.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8038019025 + 13586596 = 89655^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 8051605621 - 2³ = 8051605613 is a prime.

It is a super-2 number, since 2×8051605621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8051605691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4025802810 + 4025802811.

It is an arithmetic number, because the mean of its divisors is an integer number (4025802811).

Almost surely, 2^8051605621 is an apocalyptic number.

It is an amenable number.

8051605621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8051605621 is an equidigital number, since it uses as much as digits as its factorization.

8051605621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 8051605621 is about 89730.7395545139. The cubic root of 8051605621 is about 2004.2912543993.

The spelling of 8051605621 in words is "eight billion, fifty-one million, six hundred five thousand, six hundred twenty-one".