648966615 has 16 divisors (see below), whose sum is σ = 1132742016. Its totient is φ = 314650400.

The previous prime is 648966601. The next prime is 648966667. The reversal of 648966615 is 516669846.

It is a happy number.

It is not a de Polignac number, because 648966615 - 2⁴ = 648966599 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, 1966401 + ... + 1966730.

It is an arithmetic number, because the mean of its divisors is an integer number (70796376).

Almost surely, 2^648966615 is an apocalyptic number.

648966615 is a deficient number, since it is larger than the sum of its proper divisors (483775401).

648966615 is a wasteful number, since it uses less digits than its factorization.

648966615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933150.

The product of its digits is 1866240, while the sum is 51.

The square root of 648966615 is about 25474.8231593470. The cubic root of 648966615 is about 865.7798062135.

The spelling of 648966615 in words is "six hundred forty-eight million, nine hundred sixty-six thousand, six hundred fifteen".