1645897964164 has 6 divisors (see below), whose sum is σ = 2880321437294. Its totient is φ = 822948982080.

The previous prime is 1645897964143. The next prime is 1645897964167. The reversal of 1645897964164 is 4614697985461.

It can be written as a sum of positive squares in only one way, i.e., 1078876916100 + 567021048064 = 1038690^2 + 753008^2 .

It is a super-3 number, since 3×1645897964164³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1645897964093 and 1645897964102.

It is not an unprimeable number, because it can be changed into a prime (1645897964167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205737245517 + ... + 205737245524.

Almost surely, 2^{1645897964164} is an apocalyptic number.

It is an amenable number.

1645897964164 is a deficient number, since it is larger than the sum of its proper divisors (1234423473130).

1645897964164 is a wasteful number, since it uses less digits than its factorization.

1645897964164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411474491045 (or 411474491043 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 70.

The spelling of 1645897964164 in words is "one trillion, six hundred forty-five billion, eight hundred ninety-seven million, nine hundred sixty-four thousand, one hundred sixty-four".