1645472985256 has 8 divisors (see below), whose sum is σ = 3085261847370. Its totient is φ = 822736492624.

The previous prime is 1645472985253. The next prime is 1645472985263. The reversal of 1645472985256 is 6525892745461.

It can be written as a sum of positive squares in only one way, i.e., 1243149181156 + 402323804100 = 1114966^2 + 634290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1645472985253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102842061571 + ... + 102842061586.

Almost surely, 2^{1645472985256} is an apocalyptic number.

It is an amenable number.

1645472985256 is a deficient number, since it is larger than the sum of its proper divisors (1439788862114).

1645472985256 is a wasteful number, since it uses less digits than its factorization.

1645472985256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205684123163 (or 205684123159 counting only the distinct ones).

The product of its digits is 145152000, while the sum is 64.

The spelling of 1645472985256 in words is "one trillion, six hundred forty-five billion, four hundred seventy-two million, nine hundred eighty-five thousand, two hundred fifty-six".