49216531661 has 4 divisors (see below), whose sum is σ = 53690761824. Its totient is φ = 44742301500.

The previous prime is 49216531627. The next prime is 49216531667. The reversal of 49216531661 is 16613561294.

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 49216531661 - 2⁶ = 49216531597 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 (49216531667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2237115065 + ... + 2237115086.

It is an arithmetic number, because the mean of its divisors is an integer number (13422690456).

Almost surely, 2^49216531661 is an apocalyptic number.

It is an amenable number.

49216531661 is a deficient number, since it is larger than the sum of its proper divisors (4474230163).

49216531661 is a wasteful number, since it uses less digits than its factorization.

49216531661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474230162.

The product of its digits is 233280, while the sum is 44.

The spelling of 49216531661 in words is "forty-nine billion, two hundred sixteen million, five hundred thirty-one thousand, six hundred sixty-one".