61910540321 has 16 divisors (see below), whose sum is σ = 72178439424. Its totient is φ = 52009150464.

The previous prime is 61910540317. The next prime is 61910540323. The reversal of 61910540321 is 12304501916.

It is a cyclic number.

It is not a de Polignac number, because 61910540321 - 2² = 61910540317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61910540323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372680 + ... + 512553.

It is an arithmetic number, because the mean of its divisors is an integer number (4511152464).

Almost surely, 2^61910540321 is an apocalyptic number.

It is an amenable number.

61910540321 is a deficient number, since it is larger than the sum of its proper divisors (10267899103).

61910540321 is a wasteful number, since it uses less digits than its factorization.

61910540321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885440.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 61910540321 in words is "sixty-one billion, nine hundred ten million, five hundred forty thousand, three hundred twenty-one".