61678575523 has 4 divisors (see below), whose sum is σ = 64924816360. Its totient is φ = 58432334688.

The previous prime is 61678575521. The next prime is 61678575527. The reversal of 61678575523 is 32557587616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61678575523 - 2¹ = 61678575521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61678575521) 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, 1623120390 + ... + 1623120427.

It is an arithmetic number, because the mean of its divisors is an integer number (16231204090).

Almost surely, 2^61678575523 is an apocalyptic number.

61678575523 is a deficient number, since it is larger than the sum of its proper divisors (3246240837).

61678575523 is a wasteful number, since it uses less digits than its factorization.

61678575523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246240836.

The product of its digits is 10584000, while the sum is 55.

The spelling of 61678575523 in words is "sixty-one billion, six hundred seventy-eight million, five hundred seventy-five thousand, five hundred twenty-three".