4001425561 has 4 divisors (see below), whose sum is σ = 4573057792. Its totient is φ = 3429793332.

The previous prime is 4001425553. The next prime is 4001425567. The reversal of 4001425561 is 1655241004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4001425561 - 2³ = 4001425553 is a prime.

It is a super-2 number, since 2×4001425561² = 32022813040448329442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001425567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285816105 + ... + 285816118.

It is an arithmetic number, because the mean of its divisors is an integer number (1143264448).

Almost surely, 2^4001425561 is an apocalyptic number.

It is an amenable number.

4001425561 is a deficient number, since it is larger than the sum of its proper divisors (571632231).

4001425561 is an equidigital number, since it uses as much as digits as its factorization.

4001425561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571632230.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 4001425561 is about 63256.8222486713. The cubic root of 4001425561 is about 1587.5896076561.

Adding to 4001425561 its reverse (1655241004), we get a palindrome (5656666565).

The spelling of 4001425561 in words is "four billion, one million, four hundred twenty-five thousand, five hundred sixty-one".