256520101551237 has 24 divisors (see below), whose sum is σ = 380544205726464. Its totient is φ = 166391035989984.

The previous prime is 256520101551211. The next prime is 256520101551257. The reversal of 256520101551237 is 732155101025652.

256520101551237 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 20 + 101 + 5 + 512 + 3 + 7 = 666.

It is not a de Polignac number, because 256520101551237 - 2¹⁹ = 256520101026949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256520101551192 and 256520101551201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256520101551257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262776948 + ... + 263751330.

It is an arithmetic number, because the mean of its divisors is an integer number (15856008571936).

Almost surely, 2^{256520101551237} is an apocalyptic number.

It is an amenable number.

256520101551237 is a deficient number, since it is larger than the sum of its proper divisors (124024104175227).

256520101551237 is a wasteful number, since it uses less digits than its factorization.

256520101551237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765009 (or 1765006 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

Adding to 256520101551237 its reverse (732155101025652), we get a palindrome (988675202576889).

The spelling of 256520101551237 in words is "two hundred fifty-six trillion, five hundred twenty billion, one hundred one million, five hundred fifty-one thousand, two hundred thirty-seven".