61077685321 has 9 divisors (see below), whose sum is σ = 62265191079. Its totient is φ = 59912424936.

The previous prime is 61077685297. The next prime is 61077685367. The reversal of 61077685321 is 12358677016.

The square root of 61077685321 is 247139.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 44030727225 + 17046958096 = 209835^2 + 130564^2 .

It is not a de Polignac number, because 61077685321 - 2¹¹ = 61077683273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61077685021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13096036 + ... + 13100698.

Almost surely, 2^61077685321 is an apocalyptic number.

61077685321 is the 247139-th square number.

61077685321 is the 123570-th centered octagonal number.

It is an amenable number.

61077685321 is a deficient number, since it is larger than the sum of its proper divisors (1187505758).

61077685321 is an frugal number, since it uses more digits than its factorization.

61077685321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432 (or 4716 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 61077685321 in words is "sixty-one billion, seventy-seven million, six hundred eighty-five thousand, three hundred twenty-one".