155766567561 has 16 divisors (see below), whose sum is σ = 226912352448. Its totient is φ = 94261147200.

The previous prime is 155766567533. The next prime is 155766567563. The reversal of 155766567561 is 165765667551.

It is not a de Polignac number, because 155766567561 - 2¹⁰ = 155766566537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155766567495 and 155766567504.

It is not an unprimeable number, because it can be changed into a prime (155766567563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3548686 + ... + 3592311.

It is an arithmetic number, because the mean of its divisors is an integer number (14182022028).

Almost surely, 2^155766567561 is an apocalyptic number.

155766567561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155766567561 is a deficient number, since it is larger than the sum of its proper divisors (71145784887).

155766567561 is a wasteful number, since it uses less digits than its factorization.

155766567561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141672.

The product of its digits is 39690000, while the sum is 60.

It can be divided in two parts, 155766 and 567561, that added together give a palindrome (723327).

The spelling of 155766567561 in words is "one hundred fifty-five billion, seven hundred sixty-six million, five hundred sixty-seven thousand, five hundred sixty-one".