49357061581 has 2 divisors, whose sum is σ = 49357061582. Its totient is φ = 49357061580.

The previous prime is 49357061573. The next prime is 49357061591. The reversal of 49357061581 is 18516075394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40276877481 + 9080184100 = 200691^2 + 95290^2 .

It is a cyclic number.

It is not a de Polignac number, because 49357061581 - 2³ = 49357061573 is a prime.

It is a super-2 number, since 2×49357061581² (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 (49357061521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24678530790 + 24678530791.

It is an arithmetic number, because the mean of its divisors is an integer number (24678530791).

Almost surely, 2^49357061581 is an apocalyptic number.

It is an amenable number.

49357061581 is a deficient number, since it is larger than the sum of its proper divisors (1).

49357061581 is an equidigital number, since it uses as much as digits as its factorization.

49357061581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 49357061581 in words is "forty-nine billion, three hundred fifty-seven million, sixty-one thousand, five hundred eighty-one".