1561917396269 has 32 divisors (see below), whose sum is σ = 1743151104000. Its totient is φ = 1393341614784.

The previous prime is 1561917396241. The next prime is 1561917396287. The reversal of 1561917396269 is 9626937191651.

It is not a de Polignac number, because 1561917396269 - 2¹⁶ = 1561917330733 is a prime.

It is a super-2 number, since 2×1561917396269² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561917396239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7222292 + ... + 7435410.

It is an arithmetic number, because the mean of its divisors is an integer number (54473472000).

Almost surely, 2^{1561917396269} is an apocalyptic number.

1561917396269 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1561917396269 is a deficient number, since it is larger than the sum of its proper divisors (181233707731).

1561917396269 is a wasteful number, since it uses less digits than its factorization.

1561917396269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213497.

The product of its digits is 33067440, while the sum is 65.

The spelling of 1561917396269 in words is "one trillion, five hundred sixty-one billion, nine hundred seventeen million, three hundred ninety-six thousand, two hundred sixty-nine".