56524427521981 has 4 divisors (see below), whose sum is σ = 56524803167772. Its totient is φ = 56524051876192.

The previous prime is 56524427521979. The next prime is 56524427522027. The reversal of 56524427521981 is 18912572442565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52072892984025 + 4451534537956 = 7216155^2 + 2109866^2 .

It is a cyclic number.

It is not a de Polignac number, because 56524427521981 - 2¹ = 56524427521979 is a prime.

It is a super-2 number, since 2×56524427521981² (a number of 28 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 (56524427521781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187597096 + ... + 187898161.

It is an arithmetic number, because the mean of its divisors is an integer number (14131200791943).

Almost surely, 2^{56524427521981} is an apocalyptic number.

It is an amenable number.

56524427521981 is a deficient number, since it is larger than the sum of its proper divisors (375645791).

56524427521981 is a wasteful number, since it uses less digits than its factorization.

56524427521981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375645790.

The product of its digits is 48384000, while the sum is 61.

The spelling of 56524427521981 in words is "fifty-six trillion, five hundred twenty-four billion, four hundred twenty-seven million, five hundred twenty-one thousand, nine hundred eighty-one".