61077381221 has 4 divisors (see below), whose sum is σ = 62728121292. Its totient is φ = 59426641152.

The previous prime is 61077381191. The next prime is 61077381251. The reversal of 61077381221 is 12218377016.

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

It is an interprime number because it is at equal distance from previous prime (61077381191) and next prime (61077381251).

It can be written as a sum of positive squares in 2 ways, for example, as 42407164900 + 18670216321 = 205930^2 + 136639^2 .

It is a cyclic number.

It is not a de Polignac number, because 61077381221 - 2²² = 61073186917 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 (61077381251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825369980 + ... + 825370053.

It is an arithmetic number, because the mean of its divisors is an integer number (15682030323).

Almost surely, 2^61077381221 is an apocalyptic number.

It is an amenable number.

61077381221 is a deficient number, since it is larger than the sum of its proper divisors (1650740071).

61077381221 is a wasteful number, since it uses less digits than its factorization.

61077381221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650740070.

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 61077381221 in words is "sixty-one billion, seventy-seven million, three hundred eighty-one thousand, two hundred twenty-one".