1644010401 has 16 divisors (see below), whose sum is σ = 2399463360. Its totient is φ = 992963520.

The previous prime is 1644010393. The next prime is 1644010409. The reversal of 1644010401 is 1040104461.

It is an interprime number because it is at equal distance from previous prime (1644010393) and next prime (1644010409).

It is not a de Polignac number, because 1644010401 - 2³ = 1644010393 is a prime.

It is a super-3 number, since 3×1644010401³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644010409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75346 + ... + 94683.

It is an arithmetic number, because the mean of its divisors is an integer number (149966460).

Almost surely, 2^1644010401 is an apocalyptic number.

1644010401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1644010401 is a deficient number, since it is larger than the sum of its proper divisors (755452959).

1644010401 is a wasteful number, since it uses less digits than its factorization.

1644010401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170336.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1644010401 is about 40546.3981260975. The cubic root of 1644010401 is about 1180.2341776445.

Adding to 1644010401 its reverse (1040104461), we get a palindrome (2684114862).

The spelling of 1644010401 in words is "one billion, six hundred forty-four million, ten thousand, four hundred one".