49163971621 has 2 divisors, whose sum is σ = 49163971622. Its totient is φ = 49163971620.

The previous prime is 49163971601. The next prime is 49163971673. The reversal of 49163971621 is 12617936194.

49163971621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37291472100 + 11872499521 = 193110^2 + 108961^2 .

It is a cyclic number.

It is not a de Polignac number, because 49163971621 - 2⁵ = 49163971589 is a prime.

It is a super-2 number, since 2×49163971621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49163971601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24581985810 + 24581985811.

It is an arithmetic number, because the mean of its divisors is an integer number (24581985811).

Almost surely, 2^49163971621 is an apocalyptic number.

It is an amenable number.

49163971621 is a deficient number, since it is larger than the sum of its proper divisors (1).

49163971621 is an equidigital number, since it uses as much as digits as its factorization.

49163971621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The spelling of 49163971621 in words is "forty-nine billion, one hundred sixty-three million, nine hundred seventy-one thousand, six hundred twenty-one".