15541420057 has 2 divisors, whose sum is σ = 15541420058. Its totient is φ = 15541420056.

The previous prime is 15541420049. The next prime is 15541420079. The reversal of 15541420057 is 75002414551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13240874761 + 2300545296 = 115069^2 + 47964^2 .

It is a cyclic number.

It is not a de Polignac number, because 15541420057 - 2³ = 15541420049 is a prime.

It is not a weakly prime, because it can be changed into another prime (15541420007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770710028 + 7770710029.

It is an arithmetic number, because the mean of its divisors is an integer number (7770710029).

Almost surely, 2^15541420057 is an apocalyptic number.

It is an amenable number.

15541420057 is a deficient number, since it is larger than the sum of its proper divisors (1).

15541420057 is an equidigital number, since it uses as much as digits as its factorization.

15541420057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 34.

The spelling of 15541420057 in words is "fifteen billion, five hundred forty-one million, four hundred twenty thousand, fifty-seven".