4467881561 has 54 divisors (see below), whose sum is σ = 5523151914. Its totient is φ = 3607718400.

The previous prime is 4467881557. The next prime is 4467881567. The reversal of 4467881561 is 1651887644.

It can be written as a sum of positive squares in 9 ways, for example, as 3153384025 + 1314497536 = 56155^2 + 36256^2 .

It is not a de Polignac number, because 4467881561 - 2² = 4467881557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4467881567) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 61203821 + ... + 61203893.

It is an arithmetic number, because the mean of its divisors is an integer number (102280591).

Almost surely, 2^4467881561 is an apocalyptic number.

4467881561 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4467881561 is a deficient number, since it is larger than the sum of its proper divisors (1055270353).

4467881561 is a wasteful number, since it uses less digits than its factorization.

4467881561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 138 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The square root of 4467881561 is about 66842.2139145615. The cubic root of 4467881561 is about 1647.0263626354.

The spelling of 4467881561 in words is "four billion, four hundred sixty-seven million, eight hundred eighty-one thousand, five hundred sixty-one".