1561140295969 has 2 divisors, whose sum is σ = 1561140295970. Its totient is φ = 1561140295968.

The previous prime is 1561140295931. The next prime is 1561140295993. The reversal of 1561140295969 is 9695920411651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1349577094369 + 211563201600 = 1161713^2 + 459960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561140295969 is a prime.

It is a super-2 number, since 2×1561140295969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1561140295769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780570147984 + 780570147985.

It is an arithmetic number, because the mean of its divisors is an integer number (780570147985).

Almost surely, 2^{1561140295969} is an apocalyptic number.

It is an amenable number.

1561140295969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561140295969 is an equidigital number, since it uses as much as digits as its factorization.

1561140295969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5248800, while the sum is 58.

The spelling of 1561140295969 in words is "one trillion, five hundred sixty-one billion, one hundred forty million, two hundred ninety-five thousand, nine hundred sixty-nine".