61761216321 has 48 divisors (see below), whose sum is σ = 102604902400. Its totient is φ = 35067777120.

The previous prime is 61761216311. The next prime is 61761216383. The reversal of 61761216321 is 12361216716.

61761216321 is a `hidden beast` number, since 6 + 1 + 7 + 6 + 12 + 1 + 632 + 1 = 666.

It is not a de Polignac number, because 61761216321 - 2¹³ = 61761208129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61761216311) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8018130 + ... + 8025828.

Almost surely, 2^61761216321 is an apocalyptic number.

It is an amenable number.

61761216321 is a deficient number, since it is larger than the sum of its proper divisors (40843686079).

61761216321 is a wasteful number, since it uses less digits than its factorization.

61761216321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506 (or 8503 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The spelling of 61761216321 in words is "sixty-one billion, seven hundred sixty-one million, two hundred sixteen thousand, three hundred twenty-one".