61646730473 has 4 divisors (see below), whose sum is σ = 61647350340. Its totient is φ = 61646110608.

The previous prime is 61646730449. The next prime is 61646730503. The reversal of 61646730473 is 37403764616.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24383447104 + 37263283369 = 156152^2 + 193037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61646730473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61646030473) 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, 123290 + ... + 372147.

It is an arithmetic number, because the mean of its divisors is an integer number (15411837585).

Almost surely, 2^61646730473 is an apocalyptic number.

It is an amenable number.

61646730473 is a deficient number, since it is larger than the sum of its proper divisors (619867).

61646730473 is a wasteful number, since it uses less digits than its factorization.

61646730473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619866.

The product of its (nonzero) digits is 1524096, while the sum is 47.

The spelling of 61646730473 in words is "sixty-one billion, six hundred forty-six million, seven hundred thirty thousand, four hundred seventy-three".