255642532721 has 16 divisors (see below), whose sum is σ = 275984150400. Its totient is φ = 236071532928.

The previous prime is 255642532699. The next prime is 255642532723. The reversal of 255642532721 is 127235246552.

It is a cyclic number.

It is not a de Polignac number, because 255642532721 - 2³⁰ = 254568790897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255642532723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12941270 + ... + 12961008.

It is an arithmetic number, because the mean of its divisors is an integer number (17249009400).

Almost surely, 2^255642532721 is an apocalyptic number.

It is an amenable number.

255642532721 is a deficient number, since it is larger than the sum of its proper divisors (20341617679).

255642532721 is a wasteful number, since it uses less digits than its factorization.

255642532721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39208.

The product of its digits is 1008000, while the sum is 44.

The spelling of 255642532721 in words is "two hundred fifty-five billion, six hundred forty-two million, five hundred thirty-two thousand, seven hundred twenty-one".