1645374643131 has 4 divisors (see below), whose sum is σ = 2193832857512. Its totient is φ = 1096916428752.

The previous prime is 1645374643079. The next prime is 1645374643147. The reversal of 1645374643131 is 1313464735461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1645374643131 - 2¹¹ = 1645374641083 is a prime.

It is a super-2 number, since 2×1645374643131² (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 (1645374648131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274229107186 + ... + 274229107191.

It is an arithmetic number, because the mean of its divisors is an integer number (548458214378).

Almost surely, 2^{1645374643131} is an apocalyptic number.

1645374643131 is a deficient number, since it is larger than the sum of its proper divisors (548458214381).

1645374643131 is an equidigital number, since it uses as much as digits as its factorization.

1645374643131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548458214380.

The product of its digits is 2177280, while the sum is 48.

The spelling of 1645374643131 in words is "one trillion, six hundred forty-five billion, three hundred seventy-four million, six hundred forty-three thousand, one hundred thirty-one".