61267160221 has 4 divisors (see below), whose sum is σ = 62761481244. Its totient is φ = 59772839200.

The previous prime is 61267160219. The next prime is 61267160237. The reversal of 61267160221 is 12206176216.

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 2744292996 + 58522867225 = 52386^2 + 241915^2 .

It is a cyclic number.

It is not a de Polignac number, because 61267160221 - 2¹ = 61267160219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61267160821) 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, 747160450 + ... + 747160531.

It is an arithmetic number, because the mean of its divisors is an integer number (15690370311).

Almost surely, 2^61267160221 is an apocalyptic number.

It is an amenable number.

61267160221 is a deficient number, since it is larger than the sum of its proper divisors (1494321023).

61267160221 is a wasteful number, since it uses less digits than its factorization.

61267160221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494321022.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 61267160221 in words is "sixty-one billion, two hundred sixty-seven million, one hundred sixty thousand, two hundred twenty-one".