1015775205551 has 2 divisors, whose sum is σ = 1015775205552. Its totient is φ = 1015775205550.

The previous prime is 1015775205481. The next prime is 1015775205589. The reversal of 1015775205551 is 1555025775101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1015775205551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1015775204551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 507887602775 + 507887602776.

It is an arithmetic number, because the mean of its divisors is an integer number (507887602776).

Almost surely, 2^{1015775205551} is an apocalyptic number.

1015775205551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1015775205551 is an equidigital number, since it uses as much as digits as its factorization.

1015775205551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306250, while the sum is 44.

The spelling of 1015775205551 in words is "one trillion, fifteen billion, seven hundred seventy-five million, two hundred five thousand, five hundred fifty-one".