61794930781 has 4 divisors (see below), whose sum is σ = 61907901952. Its totient is φ = 61681959612.

The previous prime is 61794930761. The next prime is 61794930787. The reversal of 61794930781 is 18703949716.

61794930781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61794930781 - 2⁷ = 61794930653 is a prime.

It is a super-2 number, since 2×61794930781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61794930787) 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, 56484765 + ... + 56485858.

It is an arithmetic number, because the mean of its divisors is an integer number (15476975488).

Almost surely, 2^61794930781 is an apocalyptic number.

It is an amenable number.

61794930781 is a deficient number, since it is larger than the sum of its proper divisors (112971171).

61794930781 is a wasteful number, since it uses less digits than its factorization.

61794930781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112971170.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 61794930781 in words is "sixty-one billion, seven hundred ninety-four million, nine hundred thirty thousand, seven hundred eighty-one".