61273263493 has 4 divisors (see below), whose sum is σ = 65986591468. Its totient is φ = 56559935520.

The previous prime is 61273263461. The next prime is 61273263503. The reversal of 61273263493 is 39436237216.

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 21790778689 + 39482484804 = 147617^2 + 198702^2 .

It is a cyclic number.

It is not a de Polignac number, because 61273263493 - 2⁵ = 61273263461 is a prime.

It is a super-2 number, since 2×61273263493² (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 (61273263433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2356663968 + ... + 2356663993.

It is an arithmetic number, because the mean of its divisors is an integer number (16496647867).

Almost surely, 2^61273263493 is an apocalyptic number.

It is an amenable number.

61273263493 is a deficient number, since it is larger than the sum of its proper divisors (4713327975).

61273263493 is a wasteful number, since it uses less digits than its factorization.

61273263493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4713327974.

The product of its digits is 979776, while the sum is 46.

The spelling of 61273263493 in words is "sixty-one billion, two hundred seventy-three million, two hundred sixty-three thousand, four hundred ninety-three".