1645421679361 has 8 divisors (see below), whose sum is σ = 1733182945920. Its totient is φ = 1557776425392.

The previous prime is 1645421679353. The next prime is 1645421679431. The reversal of 1645421679361 is 1639761245461.

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 1645421679361 - 2³ = 1645421679353 is a prime.

It is a super-2 number, since 2×1645421679361² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645421679311) 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, 28974025 + ... + 29030758.

It is an arithmetic number, because the mean of its divisors is an integer number (216647868240).

Almost surely, 2^{1645421679361} is an apocalyptic number.

It is an amenable number.

1645421679361 is a deficient number, since it is larger than the sum of its proper divisors (87761266559).

1645421679361 is a wasteful number, since it uses less digits than its factorization.

1645421679361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58006295.

The product of its digits is 6531840, while the sum is 55.

The spelling of 1645421679361 in words is "one trillion, six hundred forty-five billion, four hundred twenty-one million, six hundred seventy-nine thousand, three hundred sixty-one".