1264813209840 has 80 divisors (see below), whose sum is σ = 3931604932608. Its totient is φ = 336364470528.

The previous prime is 1264813209823. The next prime is 1264813209841. The reversal of 1264813209840 is 489023184621.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1264813209840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264813209841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7091832 + ... + 7267991.

Almost surely, 2^{1264813209840} is an apocalyptic number.

1264813209840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264813209840 is an abundant number, since it is smaller than the sum of its proper divisors (2666791722768).

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

1264813209840 is a wasteful number, since it uses less digits than its factorization.

1264813209840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14360206 (or 14360200 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 1264813209840 in words is "one trillion, two hundred sixty-four billion, eight hundred thirteen million, two hundred nine thousand, eight hundred forty".