1645040034651 has 8 divisors (see below), whose sum is σ = 2362108767760. Its totient is φ = 1012332328992.

The previous prime is 1645040034643. The next prime is 1645040034661. The reversal of 1645040034651 is 1564300405461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1645040034651 - 2³ = 1645040034643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 42180513709 = 1645040034651 / (1 + 6 + 4 + 5 + 0 + 4 + 0 + 0 + 3 + 4 + 6 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645040034661) 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, 21090256816 + ... + 21090256893.

It is an arithmetic number, because the mean of its divisors is an integer number (295263595970).

Almost surely, 2^{1645040034651} is an apocalyptic number.

1645040034651 is a deficient number, since it is larger than the sum of its proper divisors (717068733109).

1645040034651 is a wasteful number, since it uses less digits than its factorization.

1645040034651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42180513725.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 1645040034651 in words is "one trillion, six hundred forty-five billion, forty million, thirty-four thousand, six hundred fifty-one".