1361257556644 has 24 divisors (see below), whose sum is σ = 2399358943800. Its totient is φ = 675730888704.

The previous prime is 1361257556641. The next prime is 1361257556647. The reversal of 1361257556644 is 4466557521631.

It is an interprime number because it is at equal distance from previous prime (1361257556641) and next prime (1361257556647).

It can be written as a sum of positive squares in 4 ways, for example, as 23793062500 + 1337464494144 = 154250^2 + 1156488^2 .

It is not an unprimeable number, because it can be changed into a prime (1361257556641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667332 + ... + 1779844.

It is an arithmetic number, because the mean of its divisors is an integer number (99973289325).

Almost surely, 2^{1361257556644} is an apocalyptic number.

It is an amenable number.

1361257556644 is a deficient number, since it is larger than the sum of its proper divisors (1038101387156).

1361257556644 is a wasteful number, since it uses less digits than its factorization.

1361257556644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114719 (or 1114717 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 55.

The spelling of 1361257556644 in words is "one trillion, three hundred sixty-one billion, two hundred fifty-seven million, five hundred fifty-six thousand, six hundred forty-four".