645461440215 has 16 divisors (see below), whose sum is σ = 1040870105088. Its totient is φ = 341535501216.

The previous prime is 645461440207. The next prime is 645461440223. The reversal of 645461440215 is 512044164546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645461440207) and next prime (645461440223).

It is not a de Polignac number, because 645461440215 - 2³ = 645461440207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169410547 + ... + 169414356.

It is an arithmetic number, because the mean of its divisors is an integer number (65054381568).

Almost surely, 2^645461440215 is an apocalyptic number.

645461440215 is a deficient number, since it is larger than the sum of its proper divisors (395408664873).

645461440215 is a wasteful number, since it uses less digits than its factorization.

645461440215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338825038.

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 645461440215 in words is "six hundred forty-five billion, four hundred sixty-one million, four hundred forty thousand, two hundred fifteen".