49921397815661 has 4 divisors (see below), whose sum is σ = 49922753638524. Its totient is φ = 49920042029620.

The previous prime is 49921397815573. The next prime is 49921397815687. The reversal of 49921397815661 is 16651879312994.

The cubic root of 49921397815661 is 36821.

It is a perfect power (a cube), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 762635424100 + 49158762391561 = 873290^2 + 7011331^2 .

It is a de Polignac number, because none of the positive numbers 2^k-49921397815661 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 (49921397815061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355767631 + ... + 1355804451.

It is an arithmetic number, because the mean of its divisors is an integer number (12480688409631).

Almost surely, 2^{49921397815661} is an apocalyptic number.

It is an amenable number.

49921397815661 is a deficient number, since it is larger than the sum of its proper divisors (1355822863).

49921397815661 is an frugal number, since it uses more digits than its factorization.

49921397815661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110463 (or 36821 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 71.

The spelling of 49921397815661 in words is "forty-nine trillion, nine hundred twenty-one billion, three hundred ninety-seven million, eight hundred fifteen thousand, six hundred sixty-one".