65955998761 has 9 divisors (see below), whose sum is σ = 70068622999. Its totient is φ = 62072125024.

The previous prime is 65955998729. The next prime is 65955998767. The reversal of 65955998761 is 16789955956.

The square root of 65955998761 is 256819.

It is a perfect power (a square), and thus also a powerful number.

65955998761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 51349826025 + 14606172736 = 226605^2 + 120856^2 .

It is not a de Polignac number, because 65955998761 - 2⁵ = 65955998729 is a prime.

It is a super-2 number, since 2×65955998761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65955998767) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4358370 + ... + 4373476.

Almost surely, 2^65955998761 is an apocalyptic number.

65955998761 is the 256819-th square number.

65955998761 is the 128410-th centered octagonal number.

It is an amenable number.

65955998761 is a deficient number, since it is larger than the sum of its proper divisors (4112624238).

65955998761 is an frugal number, since it uses more digits than its factorization.

65955998761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30248 (or 15124 counting only the distinct ones).

The product of its digits is 183708000, while the sum is 70.

The spelling of 65955998761 in words is "sixty-five billion, nine hundred fifty-five million, nine hundred ninety-eight thousand, seven hundred sixty-one".