65561001155 has 16 divisors (see below), whose sum is σ = 87458052864. Its totient is φ = 46852525440.

The previous prime is 65561001151. The next prime is 65561001161. The reversal of 65561001155 is 55110016556.

It is not a de Polignac number, because 65561001155 - 2² = 65561001151 is a prime.

It is a super-2 number, since 2×65561001155² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65561001151) 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, 16266224 + ... + 16270253.

It is an arithmetic number, because the mean of its divisors is an integer number (5466128304).

Almost surely, 2^65561001155 is an apocalyptic number.

65561001155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

65561001155 is a deficient number, since it is larger than the sum of its proper divisors (21897051709).

65561001155 is a wasteful number, since it uses less digits than its factorization.

65561001155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32536526.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 65561001155 in words is "sixty-five billion, five hundred sixty-one million, one thousand, one hundred fifty-five".