61491676529 has 4 divisors (see below), whose sum is σ = 61492867440. Its totient is φ = 61490485620.

The previous prime is 61491676523. The next prime is 61491676537. The reversal of 61491676529 is 92567619416.

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 61491676529 - 2⁸ = 61491676273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61491676523) 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, 514319 + ... + 622500.

It is an arithmetic number, because the mean of its divisors is an integer number (15373216860).

Almost surely, 2^61491676529 is an apocalyptic number.

It is an amenable number.

61491676529 is a deficient number, since it is larger than the sum of its proper divisors (1190911).

61491676529 is a wasteful number, since it uses less digits than its factorization.

61491676529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190910.

The product of its digits is 4898880, while the sum is 56.

The spelling of 61491676529 in words is "sixty-one billion, four hundred ninety-one million, six hundred seventy-six thousand, five hundred twenty-nine".