661422441 has 4 divisors (see below), whose sum is σ = 881896592. Its totient is φ = 440948292.

The previous prime is 661422409. The next prime is 661422481. The reversal of 661422441 is 144224166.

It is a happy number.

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 661422441 - 2⁵ = 661422409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661422399 and 661422408.

It is not an unprimeable number, because it can be changed into a prime (661422481) 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, 110237071 + ... + 110237076.

It is an arithmetic number, because the mean of its divisors is an integer number (220474148).

Almost surely, 2^661422441 is an apocalyptic number.

It is an amenable number.

661422441 is a deficient number, since it is larger than the sum of its proper divisors (220474151).

661422441 is a wasteful number, since it uses less digits than its factorization.

661422441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220474150.

The product of its digits is 9216, while the sum is 30.

The square root of 661422441 is about 25718.1344774461. The cubic root of 661422441 is about 871.2838055205.

The spelling of 661422441 in words is "six hundred sixty-one million, four hundred twenty-two thousand, four hundred forty-one".