645162667 has 4 divisors (see below), whose sum is σ = 650242816. Its totient is φ = 640082520.

The previous prime is 645162653. The next prime is 645162671. The reversal of 645162667 is 766261546.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645162667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645162967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2539884 + ... + 2540137.

It is an arithmetic number, because the mean of its divisors is an integer number (162560704).

Almost surely, 2^645162667 is an apocalyptic number.

645162667 is a deficient number, since it is larger than the sum of its proper divisors (5080149).

645162667 is a wasteful number, since it uses less digits than its factorization.

645162667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080148.

The product of its digits is 362880, while the sum is 43.

The square root of 645162667 is about 25400.0524999457. The cubic root of 645162667 is about 864.0848874036.

The spelling of 645162667 in words is "six hundred forty-five million, one hundred sixty-two thousand, six hundred sixty-seven".