1656654401 has 8 divisors (see below), whose sum is σ = 1670496744. Its totient is φ = 1642861440.

The previous prime is 1656654397. The next prime is 1656654463. The reversal of 1656654401 is 1044566561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 541027600 + 1115626801 = 23260^2 + 33401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1656654401 - 2² = 1656654397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656654491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56621 + ... + 80741.

It is an arithmetic number, because the mean of its divisors is an integer number (208812093).

Almost surely, 2^1656654401 is an apocalyptic number.

It is an amenable number.

1656654401 is a deficient number, since it is larger than the sum of its proper divisors (13842343).

1656654401 is a wasteful number, since it uses less digits than its factorization.

1656654401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24691.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 1656654401 is about 40702.0196181959. The cubic root of 1656654401 is about 1183.2521606865.

It can be divided in two parts, 165 and 6654401, that added together give a palindrome (6654566).

The spelling of 1656654401 in words is "one billion, six hundred fifty-six million, six hundred fifty-four thousand, four hundred one".