645497151 has 8 divisors (see below), whose sum is σ = 926867760. Its totient is φ = 397228992.

The previous prime is 645497147. The next prime is 645497173. The reversal of 645497151 is 151794546.

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

It is not a de Polignac number, because 645497151 - 2² = 645497147 is a prime.

It is a super-4 number, since 4×645497151⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645497101) 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, 8275566 + ... + 8275643.

It is an arithmetic number, because the mean of its divisors is an integer number (115858470).

Almost surely, 2^645497151 is an apocalyptic number.

645497151 is a deficient number, since it is larger than the sum of its proper divisors (281370609).

645497151 is a wasteful number, since it uses less digits than its factorization.

645497151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16551225.

The product of its digits is 151200, while the sum is 42.

The square root of 645497151 is about 25406.6359638579. The cubic root of 645497151 is about 864.2341896137.

The spelling of 645497151 in words is "six hundred forty-five million, four hundred ninety-seven thousand, one hundred fifty-one".