1645471906231 has 8 divisors (see below), whose sum is σ = 1683766465920. Its totient is φ = 1607178608952.

The previous prime is 1645471906223. The next prime is 1645471906291. The reversal of 1645471906231 is 1326091745461.

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 1645471906231 - 2³ = 1645471906223 is a prime.

It is a super-2 number, since 2×1645471906231² (a number of 25 digits) contains 22 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 (1645471906201) 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, 2639940 + ... + 3203158.

It is an arithmetic number, because the mean of its divisors is an integer number (210470808240).

Almost surely, 2^{1645471906231} is an apocalyptic number.

1645471906231 is a deficient number, since it is larger than the sum of its proper divisors (38294559689).

1645471906231 is an equidigital number, since it uses as much as digits as its factorization.

1645471906231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631205.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 1645471906231 in words is "one trillion, six hundred forty-five billion, four hundred seventy-one million, nine hundred six thousand, two hundred thirty-one".