661522432 has 24 divisors (see below), whose sum is σ = 1322725950. Its totient is φ = 330760192.

The previous prime is 661522409. The next prime is 661522439. The reversal of 661522432 is 234225166.

It can be written as a sum of positive squares in only one way, i.e., 442008576 + 219513856 = 21024^2 + 14816^2 .

It is a super-2 number, since 2×661522432² = 875223856078389248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661522394 and 661522403.

It is not an unprimeable number, because it can be changed into a prime (661522439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159457 + ... + 163552.

Almost surely, 2^661522432 is an apocalyptic number.

It is an amenable number.

661522432 is a deficient number, since it is larger than the sum of its proper divisors (661203518).

661522432 is an equidigital number, since it uses as much as digits as its factorization.

661522432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323031 (or 323011 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 661522432 is about 25720.0783824622. The cubic root of 661522432 is about 871.3277089543.

Adding to 661522432 its reverse (234225166), we get a palindrome (895747598).

The spelling of 661522432 in words is "six hundred sixty-one million, five hundred twenty-two thousand, four hundred thirty-two".