645156252346 has 4 divisors (see below), whose sum is σ = 967734378522. Its totient is φ = 322578126172.

The previous prime is 645156252337. The next prime is 645156252359. The reversal of 645156252346 is 643252651546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 643025968321 + 2130284025 = 801889^2 + 46155^2 .

It is a super-2 number, since 2×645156252346² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 645156252346.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161289063085 + ... + 161289063088.

Almost surely, 2^645156252346 is an apocalyptic number.

645156252346 is a deficient number, since it is larger than the sum of its proper divisors (322578126176).

645156252346 is a wasteful number, since it uses less digits than its factorization.

645156252346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322578126175.

The product of its digits is 5184000, while the sum is 49.

The spelling of 645156252346 in words is "six hundred forty-five billion, one hundred fifty-six million, two hundred fifty-two thousand, three hundred forty-six".