661211734233 has 16 divisors (see below), whose sum is σ = 919994924160. Its totient is φ = 421620190464.

The previous prime is 661211734223. The next prime is 661211734243. The reversal of 661211734233 is 332437112166.

661211734233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661211734223) and next prime (661211734243).

It is not a de Polignac number, because 661211734233 - 2¹⁰ = 661211733209 is a prime.

It is a super-2 number, since 2×661211734233² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661211734191 and 661211734200.

It is not an unprimeable number, because it can be changed into a prime (661211734213) 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, 1131435 + ... + 1613247.

It is an arithmetic number, because the mean of its divisors is an integer number (57499682760).

Almost surely, 2^661211734233 is an apocalyptic number.

It is an amenable number.

661211734233 is a deficient number, since it is larger than the sum of its proper divisors (258783189927).

661211734233 is a wasteful number, since it uses less digits than its factorization.

661211734233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501728.

The product of its digits is 108864, while the sum is 39.

Adding to 661211734233 its reverse (332437112166), we get a palindrome (993648846399).

The spelling of 661211734233 in words is "six hundred sixty-one billion, two hundred eleven million, seven hundred thirty-four thousand, two hundred thirty-three".