1645256415164 has 6 divisors (see below), whose sum is σ = 2879198726544. Its totient is φ = 822628207580.

The previous prime is 1645256415161. The next prime is 1645256415169. The reversal of 1645256415164 is 4615146525461.

It is a super-4 number, since 4×1645256415164⁴ (a number of 50 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645256415161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205657051892 + ... + 205657051899.

It is an arithmetic number, because the mean of its divisors is an integer number (479866454424).

Almost surely, 2^{1645256415164} is an apocalyptic number.

It is an amenable number.

1645256415164 is a deficient number, since it is larger than the sum of its proper divisors (1233942311380).

1645256415164 is a wasteful number, since it uses less digits than its factorization.

1645256415164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411314103795 (or 411314103793 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 50.

The spelling of 1645256415164 in words is "one trillion, six hundred forty-five billion, two hundred fifty-six million, four hundred fifteen thousand, one hundred sixty-four".