61764398933 has 4 divisors (see below), whose sum is σ = 62020682988. Its totient is φ = 61508114880.

The previous prime is 61764398893. The next prime is 61764398981. The reversal of 61764398933 is 33989346716.

It is a happy number.

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 20471314084 + 41293084849 = 143078^2 + 203207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61764398933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61764308933) 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, 128141666 + ... + 128142147.

It is an arithmetic number, because the mean of its divisors is an integer number (15505170747).

Almost surely, 2^61764398933 is an apocalyptic number.

It is an amenable number.

61764398933 is a deficient number, since it is larger than the sum of its proper divisors (256284055).

61764398933 is a wasteful number, since it uses less digits than its factorization.

61764398933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256284054.

The product of its digits is 17635968, while the sum is 59.

The spelling of 61764398933 in words is "sixty-one billion, seven hundred sixty-four million, three hundred ninety-eight thousand, nine hundred thirty-three".