3645906881 has 2 divisors, whose sum is σ = 3645906882. Its totient is φ = 3645906880.

The previous prime is 3645906857. The next prime is 3645906899. The reversal of 3645906881 is 1886095463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3588010000 + 57896881 = 59900^2 + 7609^2 .

It is a cyclic number.

It is not a de Polignac number, because 3645906881 - 2²⁶ = 3578798017 is a prime.

It is a super-2 number, since 2×3645906881² = 26585273969846296322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3645906811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822953440 + 1822953441.

It is an arithmetic number, because the mean of its divisors is an integer number (1822953441).

Almost surely, 2^3645906881 is an apocalyptic number.

It is an amenable number.

3645906881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3645906881 is an equidigital number, since it uses as much as digits as its factorization.

3645906881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 3645906881 is about 60381.3454719254. The cubic root of 3645906881 is about 1539.1059747337.

The spelling of 3645906881 in words is "three billion, six hundred forty-five million, nine hundred six thousand, eight hundred eighty-one".