1261564828404 has 12 divisors (see below), whose sum is σ = 2943651266304. Its totient is φ = 420521609464.

The previous prime is 1261564828387. The next prime is 1261564828417. The reversal of 1261564828404 is 4048284651621.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×1261564828404³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52565201172 + ... + 52565201195.

It is an arithmetic number, because the mean of its divisors is an integer number (245304272192).

Almost surely, 2^{1261564828404} is an apocalyptic number.

It is an amenable number.

1261564828404 is an abundant number, since it is smaller than the sum of its proper divisors (1682086437900).

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

1261564828404 is a wasteful number, since it uses less digits than its factorization.

1261564828404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105130402374 (or 105130402372 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 51.

The spelling of 1261564828404 in words is "one trillion, two hundred sixty-one billion, five hundred sixty-four million, eight hundred twenty-eight thousand, four hundred four".