61940812321 has 4 divisors (see below), whose sum is σ = 61982637444. Its totient is φ = 61898987200.

The previous prime is 61940812309. The next prime is 61940812327. The reversal of 61940812321 is 12321804916.

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 8923447296 + 53017365025 = 94464^2 + 230255^2 .

It is a cyclic number.

It is not a de Polignac number, because 61940812321 - 2¹⁷ = 61940681249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61940812327) 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, 20910340 + ... + 20913301.

It is an arithmetic number, because the mean of its divisors is an integer number (15495659361).

Almost surely, 2^61940812321 is an apocalyptic number.

It is an amenable number.

61940812321 is a deficient number, since it is larger than the sum of its proper divisors (41825123).

61940812321 is a wasteful number, since it uses less digits than its factorization.

61940812321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41825122.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 61940812321 in words is "sixty-one billion, nine hundred forty million, eight hundred twelve thousand, three hundred twenty-one".