61527256321 has 4 divisors (see below), whose sum is σ = 61572069972. Its totient is φ = 61482442672.

The previous prime is 61527256249. The next prime is 61527256363. The reversal of 61527256321 is 12365272516.

61527256321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 30542455696 + 30984800625 = 174764^2 + 176025^2 .

It is a cyclic number.

It is not a de Polignac number, because 61527256321 - 2¹⁵ = 61527223553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61527256391) 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, 22404766 + ... + 22407511.

It is an arithmetic number, because the mean of its divisors is an integer number (15393017493).

Almost surely, 2^61527256321 is an apocalyptic number.

It is an amenable number.

61527256321 is a deficient number, since it is larger than the sum of its proper divisors (44813651).

61527256321 is a wasteful number, since it uses less digits than its factorization.

61527256321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44813650.

The product of its digits is 151200, while the sum is 40.

The spelling of 61527256321 in words is "sixty-one billion, five hundred twenty-seven million, two hundred fifty-six thousand, three hundred twenty-one".