263415649780 has 24 divisors (see below), whose sum is σ = 553263612552. Its totient is φ = 105348974592.

The previous prime is 263415649729. The next prime is 263415649787. The reversal of 263415649780 is 87946514362.

It can be written as a sum of positive squares in 4 ways, for example, as 68095504 + 263347554276 = 8252^2 + 513174^2 .

It is a super-2 number, since 2×263415649780² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263415649787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955017 + ... + 1199536.

It is an arithmetic number, because the mean of its divisors is an integer number (23052650523).

It is a 1-persistent number, because it is pandigital, but 2⋅263415649780 = 526831299560 is not.

Almost surely, 2^263415649780 is an apocalyptic number.

263415649780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263415649780 is an abundant number, since it is smaller than the sum of its proper divisors (289847962772).

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

263415649780 is a wasteful number, since it uses less digits than its factorization.

263415649780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160675 (or 2160673 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 263415649780 in words is "two hundred sixty-three billion, four hundred fifteen million, six hundred forty-nine thousand, seven hundred eighty".