648721755870 has 32 divisors (see below), whose sum is σ = 1557329369472. Its totient is φ = 172948339872.

The previous prime is 648721755817. The next prime is 648721755881. The reversal of 648721755870 is 78557127846.

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, 2638372 + ... + 2873751.

It is an arithmetic number, because the mean of its divisors is an integer number (48666542796).

Almost surely, 2^648721755870 is an apocalyptic number.

648721755870 is an abundant number, since it is smaller than the sum of its proper divisors (908607613602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648721755870 is a wasteful number, since it uses less digits than its factorization.

648721755870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516056.

The product of its (nonzero) digits is 26342400, while the sum is 60.

The spelling of 648721755870 in words is "six hundred forty-eight billion, seven hundred twenty-one million, seven hundred fifty-five thousand, eight hundred seventy".