1644252053461 has 8 divisors (see below), whose sum is σ = 1684419882264. Its totient is φ = 1604087278080.

The previous prime is 1644252053453. The next prime is 1644252053489. The reversal of 1644252053461 is 1643502524461.

It can be written as a sum of positive squares in 4 ways, for example, as 10727780625 + 1633524272836 = 103575^2 + 1278094^2 .

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 1644252053461 - 2³ = 1644252053453 is a prime.

It is a super-3 number, since 3×1644252053461³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644252053161) 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, 346251 + ... + 1846183.

It is an arithmetic number, because the mean of its divisors is an integer number (210552485283).

Almost surely, 2^{1644252053461} is an apocalyptic number.

It is an amenable number.

1644252053461 is a deficient number, since it is larger than the sum of its proper divisors (40167828803).

1644252053461 is a wasteful number, since it uses less digits than its factorization.

1644252053461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526711.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 1644252053461 in words is "one trillion, six hundred forty-four billion, two hundred fifty-two million, fifty-three thousand, four hundred sixty-one".