1261759421380 has 48 divisors (see below), whose sum is σ = 2673527646384. Its totient is φ = 500182824960.

The previous prime is 1261759421369. The next prime is 1261759421393. The reversal of 1261759421380 is 831249571621.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 266206466304 + 995552955076 = 515952^2 + 997774^2 .

It is a super-2 number, since 2×1261759421380² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500440 + ... + 1665520.

It is an arithmetic number, because the mean of its divisors is an integer number (55698492633).

It is a 1-persistent number, because it is pandigital, but 2⋅1261759421380 = 2523518842760 is not.

Almost surely, 2^{1261759421380} is an apocalyptic number.

1261759421380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261759421380 is an abundant number, since it is smaller than the sum of its proper divisors (1411768225004).

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

1261759421380 is a wasteful number, since it uses less digits than its factorization.

1261759421380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165576 (or 1165574 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 1261759421380 in words is "one trillion, two hundred sixty-one billion, seven hundred fifty-nine million, four hundred twenty-one thousand, three hundred eighty".