1273620251620 has 12 divisors (see below), whose sum is σ = 2674602528444. Its totient is φ = 509448100640.

The previous prime is 1273620251611. The next prime is 1273620251621. The reversal of 1273620251620 is 261520263721.

It can be written as a sum of positive squares in 2 ways, for example, as 188323017444 + 1085297234176 = 433962^2 + 1041776^2 .

It is a super-2 number, since 2×1273620251620² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1273620251620.

It is not an unprimeable number, because it can be changed into a prime (1273620251621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31840506271 + ... + 31840506310.

It is an arithmetic number, because the mean of its divisors is an integer number (222883544037).

Almost surely, 2^{1273620251620} is an apocalyptic number.

1273620251620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273620251620 is an abundant number, since it is smaller than the sum of its proper divisors (1400982276824).

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

1273620251620 is a wasteful number, since it uses less digits than its factorization.

1273620251620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63681012590 (or 63681012588 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 1273620251620 in words is "one trillion, two hundred seventy-three billion, six hundred twenty million, two hundred fifty-one thousand, six hundred twenty".