649974479946 has 64 divisors (see below), whose sum is σ = 1502741237760. Its totient is φ = 185228322560.

The previous prime is 649974479941. The next prime is 649974479951.

649974479946 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (649974479941) and next prime (649974479951).

It is not an unprimeable number, because it can be changed into a prime (649974479941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1182535 + ... + 1642661.

It is an arithmetic number, because the mean of its divisors is an integer number (23480331840).

Almost surely, 2^649974479946 is an apocalyptic number.

649974479946 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 649974479946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751370618880).

649974479946 is an abundant number, since it is smaller than the sum of its proper divisors (852766757814).

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

649974479946 is a wasteful number, since it uses less digits than its factorization.

649974479946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461419.

The product of its digits is 2962842624, while the sum is 78.

The spelling of 649974479946 in words is "six hundred forty-nine billion, nine hundred seventy-four million, four hundred seventy-nine thousand, nine hundred forty-six".