1561155016617 has 32 divisors (see below), whose sum is σ = 2704695797760. Its totient is φ = 871342330320.

The previous prime is 1561155016583. The next prime is 1561155016627. The reversal of 1561155016617 is 7166105511651.

1561155016617 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 15 + 5 + 0 + 16 + 617 = 666.

It is not a de Polignac number, because 1561155016617 - 2¹¹ = 1561155014569 is a prime.

It is a super-2 number, since 2×1561155016617² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1561155016627) 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 in 31 ways as a sum of consecutive naturals, for example, 96039309 + ... + 96055562.

It is an arithmetic number, because the mean of its divisors is an integer number (84521743680).

Almost surely, 2^{1561155016617} is an apocalyptic number.

It is an amenable number.

1561155016617 is a deficient number, since it is larger than the sum of its proper divisors (1143540781143).

1561155016617 is a wasteful number, since it uses less digits than its factorization.

1561155016617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192094930 (or 192094924 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 45.

The spelling of 1561155016617 in words is "one trillion, five hundred sixty-one billion, one hundred fifty-five million, sixteen thousand, six hundred seventeen".