648337735690 has 16 divisors (see below), whose sum is σ = 1167017194728. Its totient is φ = 259333034176.

The previous prime is 648337735673. The next prime is 648337735709. The reversal of 648337735690 is 96537733846.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 592371897649 + 55965838041 = 769657^2 + 236571^2 .

It is a super-2 number, since 2×648337735690² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2042544 + ... + 2338516.

Almost surely, 2^648337735690 is an apocalyptic number.

648337735690 is a deficient number, since it is larger than the sum of its proper divisors (518679459038).

648337735690 is a wasteful number, since it uses less digits than its factorization.

648337735690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515033.

The product of its (nonzero) digits is 68584320, while the sum is 61.

The spelling of 648337735690 in words is "six hundred forty-eight billion, three hundred thirty-seven million, seven hundred thirty-five thousand, six hundred ninety".