1645156351 has 16 divisors (see below), whose sum is σ = 1834700544. Its totient is φ = 1467182464.

The previous prime is 1645156343. The next prime is 1645156361. The reversal of 1645156351 is 1536515461.

It is a cyclic number.

It is not a de Polignac number, because 1645156351 - 2³ = 1645156343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645156351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645156361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22176 + ... + 61498.

It is an arithmetic number, because the mean of its divisors is an integer number (114668784).

Almost surely, 2^1645156351 is an apocalyptic number.

1645156351 is a deficient number, since it is larger than the sum of its proper divisors (189544193).

1645156351 is a wasteful number, since it uses less digits than its factorization.

1645156351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39470.

The product of its digits is 54000, while the sum is 37.

The square root of 1645156351 is about 40560.5270059451. The cubic root of 1645156351 is about 1180.5083395816.

It can be divided in two parts, 164 and 5156351, that added together give a palindrome (5156515).

The spelling of 1645156351 in words is "one billion, six hundred forty-five million, one hundred fifty-six thousand, three hundred fifty-one".