1557655435981 has 8 divisors (see below), whose sum is σ = 1559026613304. Its totient is φ = 1556284404480.

The previous prime is 1557655435939. The next prime is 1557655436009. The reversal of 1557655435981 is 1895345567551.

It can be written as a sum of positive squares in 4 ways, for example, as 2980614025 + 1554674821956 = 54595^2 + 1246866^2 .

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 1557655435981 - 2¹¹ = 1557655433933 is a prime.

It is a super-2 number, since 2×1557655435981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557655435081) 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, 42243705 + ... + 42280561.

It is an arithmetic number, because the mean of its divisors is an integer number (194878326663).

Almost surely, 2^{1557655435981} is an apocalyptic number.

It is an amenable number.

1557655435981 is a deficient number, since it is larger than the sum of its proper divisors (1371177323).

1557655435981 is a wasteful number, since it uses less digits than its factorization.

1557655435981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72911.

The product of its digits is 113400000, while the sum is 64.

The spelling of 1557655435981 in words is "one trillion, five hundred fifty-seven billion, six hundred fifty-five million, four hundred thirty-five thousand, nine hundred eighty-one".