15954785057 has 2 divisors, whose sum is σ = 15954785058. Its totient is φ = 15954785056.

The previous prime is 15954785053. The next prime is 15954785123. The reversal of 15954785057 is 75058745951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032733921 + 2922051136 = 114161^2 + 54056^2 .

It is a cyclic number.

It is not a de Polignac number, because 15954785057 - 2² = 15954785053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15954784993 and 15954785011.

It is not a weakly prime, because it can be changed into another prime (15954785053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7977392528 + 7977392529.

It is an arithmetic number, because the mean of its divisors is an integer number (7977392529).

Almost surely, 2^15954785057 is an apocalyptic number.

It is an amenable number.

15954785057 is a deficient number, since it is larger than the sum of its proper divisors (1).

15954785057 is an equidigital number, since it uses as much as digits as its factorization.

15954785057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820000, while the sum is 56.

The spelling of 15954785057 in words is "fifteen billion, nine hundred fifty-four million, seven hundred eighty-five thousand, fifty-seven".