649255219790 has 16 divisors (see below), whose sum is σ = 1168673147712. Its totient is φ = 259699031904.

The previous prime is 649255219787. The next prime is 649255219829. The reversal of 649255219790 is 97912552946.

It is a super-2 number, since 2×649255219790² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 640667 + ... + 1307273.

It is an arithmetic number, because the mean of its divisors is an integer number (73042071732).

Almost surely, 2^649255219790 is an apocalyptic number.

649255219790 is a deficient number, since it is larger than the sum of its proper divisors (519417927922).

649255219790 is a wasteful number, since it uses less digits than its factorization.

649255219790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764011.

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 649255219790 in words is "six hundred forty-nine billion, two hundred fifty-five million, two hundred nineteen thousand, seven hundred ninety".