661211434 has 8 divisors (see below), whose sum is σ = 1068110820. Its totient is φ = 305174496.

The previous prime is 661211401. The next prime is 661211437. The reversal of 661211434 is 434112166.

It can be written as a sum of positive squares in 2 ways, for example, as 628755625 + 32455809 = 25075^2 + 5697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661211437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12715579 + ... + 12715630.

Almost surely, 2^661211434 is an apocalyptic number.

661211434 is a deficient number, since it is larger than the sum of its proper divisors (406899386).

661211434 is a wasteful number, since it uses less digits than its factorization.

661211434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25431224.

The product of its digits is 3456, while the sum is 28.

The square root of 661211434 is about 25714.0318503342. The cubic root of 661211434 is about 871.1911433405.

The spelling of 661211434 in words is "six hundred sixty-one million, two hundred eleven thousand, four hundred thirty-four".