1015454515561 has 2 divisors, whose sum is σ = 1015454515562. Its totient is φ = 1015454515560.

The previous prime is 1015454515553. The next prime is 1015454515577. The reversal of 1015454515561 is 1655154545101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 966792361536 + 48662154025 = 983256^2 + 220595^2 .

It is an emirp because it is prime and its reverse (1655154545101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1015454515561 - 2³ = 1015454515553 is a prime.

It is a super-2 number, since 2×1015454515561² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1015454515591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 507727257780 + 507727257781.

It is an arithmetic number, because the mean of its divisors is an integer number (507727257781).

Almost surely, 2^{1015454515561} is an apocalyptic number.

It is an amenable number.

1015454515561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1015454515561 is an equidigital number, since it uses as much as digits as its factorization.

1015454515561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300000, while the sum is 43.

The spelling of 1015454515561 in words is "one trillion, fifteen billion, four hundred fifty-four million, five hundred fifteen thousand, five hundred sixty-one".