1361257625561 has 8 divisors (see below), whose sum is σ = 1362971688000. Its totient is φ = 1359543865680.

The previous prime is 1361257625543. The next prime is 1361257625603. The reversal of 1361257625561 is 1655267521631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1361257625561 - 2¹⁴ = 1361257609177 is a prime.

It is a super-3 number, since 3×1361257625561³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361257625461) 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, 9722231 + ... + 9861251.

It is an arithmetic number, because the mean of its divisors is an integer number (170371461000).

Almost surely, 2^{1361257625561} is an apocalyptic number.

It is an amenable number.

1361257625561 is a deficient number, since it is larger than the sum of its proper divisors (1714062439).

1361257625561 is a wasteful number, since it uses less digits than its factorization.

1361257625561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151279.

The product of its digits is 2268000, while the sum is 50.

The spelling of 1361257625561 in words is "one trillion, three hundred sixty-one billion, two hundred fifty-seven million, six hundred twenty-five thousand, five hundred sixty-one".